* Re: [OE-core] [PATCH 1/1] bitbake.conf: Set ZSTD_THREADS to half of cpu number
2021-11-09 8:48 ` [PATCH 1/1] " Robert Yang
@ 2021-11-09 8:21 ` Alexander Kanavin
2021-11-09 9:45 ` Robert Yang
2021-11-09 8:41 ` Konrad Weihmann
2021-11-09 8:45 ` Jose Quaresma
2 siblings, 1 reply; 12+ messages in thread
From: Alexander Kanavin @ 2021-11-09 8:21 UTC (permalink / raw)
To: Robert Yang; +Cc: OE-core
[-- Attachment #1: Type: text/plain, Size: 1682 bytes --]
But does this mean we need to globally restrict this and make things twice
slower for everyone? I'm not sure.
Alex
On Tue, 9 Nov 2021 at 09:12, Robert Yang <liezhi.yang@windriver.com> wrote:
> The original value is very easy to cause do_packge error when cpu number is
> larger, for example, 128 cores and 512G mem:
>
> error: create archive failed: cpio: write failed - Cannot allocate memory"
>
> Set the ZSTD_THREADS to half of the CPU number can avoid the error in my
> testing.
>
> Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
> ---
> meta/conf/bitbake.conf | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/meta/conf/bitbake.conf b/meta/conf/bitbake.conf
> index 71c1e52ad6..46ebf5113f 100644
> --- a/meta/conf/bitbake.conf
> +++ b/meta/conf/bitbake.conf
> @@ -833,7 +833,7 @@ XZ_DEFAULTS ?= "--memlimit=${XZ_MEMLIMIT}
> --threads=${XZ_THREADS}"
> XZ_DEFAULTS[vardepsexclude] += "XZ_MEMLIMIT XZ_THREADS"
>
> # Default parallelism for zstd
> -ZSTD_THREADS ?= "${@oe.utils.cpu_count(at_least=2)}"
> +ZSTD_THREADS ?= "${@int(oe.utils.cpu_count(at_least=4)/2)}"
> ZSTD_THREADS[vardepvalue] = "1"
>
> # Limit the number of threads that OpenMP libraries will use. Otherwise
> they
> --
> 2.17.1
>
>
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> Links: You receive all messages sent to this group.
> View/Reply Online (#157998):
> https://lists.openembedded.org/g/openembedded-core/message/157998
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> -=-=-=-=-=-=-=-=-=-=-=-
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^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: [OE-core] [PATCH 1/1] bitbake.conf: Set ZSTD_THREADS to half of cpu number
2021-11-09 8:48 ` [PATCH 1/1] " Robert Yang
2021-11-09 8:21 ` [OE-core] " Alexander Kanavin
@ 2021-11-09 8:41 ` Konrad Weihmann
2021-11-09 9:40 ` Robert Yang
2021-11-09 8:45 ` Jose Quaresma
2 siblings, 1 reply; 12+ messages in thread
From: Konrad Weihmann @ 2021-11-09 8:41 UTC (permalink / raw)
To: Robert Yang, openembedded-core
On 09.11.21 09:48, Robert Yang wrote:
> The original value is very easy to cause do_packge error when cpu number is
> larger, for example, 128 cores and 512G mem:
>
> error: create archive failed: cpio: write failed - Cannot allocate memory"
>
> Set the ZSTD_THREADS to half of the CPU number can avoid the error in my
> testing.
>
> Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
> ---
> meta/conf/bitbake.conf | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/meta/conf/bitbake.conf b/meta/conf/bitbake.conf
> index 71c1e52ad6..46ebf5113f 100644
> --- a/meta/conf/bitbake.conf
> +++ b/meta/conf/bitbake.conf
> @@ -833,7 +833,7 @@ XZ_DEFAULTS ?= "--memlimit=${XZ_MEMLIMIT} --threads=${XZ_THREADS}"
> XZ_DEFAULTS[vardepsexclude] += "XZ_MEMLIMIT XZ_THREADS"
>
> # Default parallelism for zstd
> -ZSTD_THREADS ?= "${@oe.utils.cpu_count(at_least=2)}"
> +ZSTD_THREADS ?= "${@int(oe.utils.cpu_count(at_least=4)/2)}"
Then why not just limit it for the large setups you are referring to in
the example, for instance like
ZSTD_THREADS ?= "${@min(int(oe.utils.cpu_count(at_least=4)), <insert a
sane value of your choice>)}"
BTW this can be also done in your local.conf - as Alex already said,
there is simply no reason to make it slower for everyone, while also
half the threads of a 128 core machine could be a trouble some setup.
Last time I had this issue (with XZ back then) I used
"${@min(int(oe.utils.cpu_count(at_least=4)), 20}"
> ZSTD_THREADS[vardepvalue] = "1"
>
> # Limit the number of threads that OpenMP libraries will use. Otherwise they
>
>
>
> -=-=-=-=-=-=-=-=-=-=-=-
> Links: You receive all messages sent to this group.
> View/Reply Online (#157998): https://lists.openembedded.org/g/openembedded-core/message/157998
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^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: [OE-core] [PATCH 1/1] bitbake.conf: Set ZSTD_THREADS to half of cpu number
2021-11-09 8:48 ` [PATCH 1/1] " Robert Yang
2021-11-09 8:21 ` [OE-core] " Alexander Kanavin
2021-11-09 8:41 ` Konrad Weihmann
@ 2021-11-09 8:45 ` Jose Quaresma
2 siblings, 0 replies; 12+ messages in thread
From: Jose Quaresma @ 2021-11-09 8:45 UTC (permalink / raw)
To: Robert Yang; +Cc: OE-core
[-- Attachment #1: Type: text/plain, Size: 1730 bytes --]
Robert Yang <liezhi.yang@windriver.com> escreveu no dia terça, 9/11/2021
à(s) 08:12:
> The original value is very easy to cause do_packge error when cpu number is
> larger, for example, 128 cores and 512G mem:
>
> error: create archive failed: cpio: write failed - Cannot allocate memory"
>
> Set the ZSTD_THREADS to half of the CPU number can avoid the error in my
> testing.
>
> Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
> ---
> meta/conf/bitbake.conf | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/meta/conf/bitbake.conf b/meta/conf/bitbake.conf
> index 71c1e52ad6..46ebf5113f 100644
> --- a/meta/conf/bitbake.conf
> +++ b/meta/conf/bitbake.conf
> @@ -833,7 +833,7 @@ XZ_DEFAULTS ?= "--memlimit=${XZ_MEMLIMIT}
> --threads=${XZ_THREADS}"
> XZ_DEFAULTS[vardepsexclude] += "XZ_MEMLIMIT XZ_THREADS"
>
> # Default parallelism for zstd
> -ZSTD_THREADS ?= "${@oe.utils.cpu_count(at_least=2)}"
> +ZSTD_THREADS ?= "${@int(oe.utils.cpu_count(at_least=4)/2)}"
>
This will slow down all the systems with lower cpu cores.
> ZSTD_THREADS[vardepvalue] = "1"
>
> # Limit the number of threads that OpenMP libraries will use. Otherwise
> they
> --
> 2.17.1
>
>
> -=-=-=-=-=-=-=-=-=-=-=-
> Links: You receive all messages sent to this group.
> View/Reply Online (#157998):
> https://lists.openembedded.org/g/openembedded-core/message/157998
> Mute This Topic: https://lists.openembedded.org/mt/86926962/5052612
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>
--
Best regards,
José Quaresma
[-- Attachment #2: Type: text/html, Size: 2970 bytes --]
^ permalink raw reply [flat|nested] 12+ messages in thread
* [PATCH 0/1] bitbake.conf: Set ZSTD_THREADS to half of cpu number
@ 2021-11-09 8:48 Robert Yang
2021-11-09 8:48 ` [PATCH 1/1] " Robert Yang
0 siblings, 1 reply; 12+ messages in thread
From: Robert Yang @ 2021-11-09 8:48 UTC (permalink / raw)
To: openembedded-core
The following changes since commit afad2f09ebbfe395f8fafce8218e26056479fe39:
meson: improve SDK's wrapper to make Wraps work (2021-11-08 22:01:53 +0000)
are available in the Git repository at:
git://git.openembedded.org/openembedded-core-contrib rbt/zstd
http://cgit.openembedded.org/openembedded-core-contrib/log/?h=rbt/zstd
Robert Yang (1):
bitbake.conf: Set ZSTD_THREADS to half of cpu number
meta/conf/bitbake.conf | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--
2.17.1
^ permalink raw reply [flat|nested] 12+ messages in thread
* [PATCH 1/1] bitbake.conf: Set ZSTD_THREADS to half of cpu number
2021-11-09 8:48 [PATCH 0/1] bitbake.conf: Set ZSTD_THREADS to half of cpu number Robert Yang
@ 2021-11-09 8:48 ` Robert Yang
2021-11-09 8:21 ` [OE-core] " Alexander Kanavin
` (2 more replies)
0 siblings, 3 replies; 12+ messages in thread
From: Robert Yang @ 2021-11-09 8:48 UTC (permalink / raw)
To: openembedded-core
The original value is very easy to cause do_packge error when cpu number is
larger, for example, 128 cores and 512G mem:
error: create archive failed: cpio: write failed - Cannot allocate memory"
Set the ZSTD_THREADS to half of the CPU number can avoid the error in my
testing.
Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
---
meta/conf/bitbake.conf | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/meta/conf/bitbake.conf b/meta/conf/bitbake.conf
index 71c1e52ad6..46ebf5113f 100644
--- a/meta/conf/bitbake.conf
+++ b/meta/conf/bitbake.conf
@@ -833,7 +833,7 @@ XZ_DEFAULTS ?= "--memlimit=${XZ_MEMLIMIT} --threads=${XZ_THREADS}"
XZ_DEFAULTS[vardepsexclude] += "XZ_MEMLIMIT XZ_THREADS"
# Default parallelism for zstd
-ZSTD_THREADS ?= "${@oe.utils.cpu_count(at_least=2)}"
+ZSTD_THREADS ?= "${@int(oe.utils.cpu_count(at_least=4)/2)}"
ZSTD_THREADS[vardepvalue] = "1"
# Limit the number of threads that OpenMP libraries will use. Otherwise they
--
2.17.1
^ permalink raw reply related [flat|nested] 12+ messages in thread
* Re: [OE-core] [PATCH 1/1] bitbake.conf: Set ZSTD_THREADS to half of cpu number
2021-11-09 8:41 ` Konrad Weihmann
@ 2021-11-09 9:40 ` Robert Yang
2021-11-09 9:44 ` Alexander Kanavin
0 siblings, 1 reply; 12+ messages in thread
From: Robert Yang @ 2021-11-09 9:40 UTC (permalink / raw)
To: Konrad Weihmann, openembedded-core
On 11/9/21 4:41 PM, Konrad Weihmann wrote:
>
>
> On 09.11.21 09:48, Robert Yang wrote:
>> The original value is very easy to cause do_packge error when cpu number is
>> larger, for example, 128 cores and 512G mem:
>>
>> error: create archive failed: cpio: write failed - Cannot allocate memory"
>>
>> Set the ZSTD_THREADS to half of the CPU number can avoid the error in my
>> testing.
>>
>> Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
>> ---
>> meta/conf/bitbake.conf | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/meta/conf/bitbake.conf b/meta/conf/bitbake.conf
>> index 71c1e52ad6..46ebf5113f 100644
>> --- a/meta/conf/bitbake.conf
>> +++ b/meta/conf/bitbake.conf
>> @@ -833,7 +833,7 @@ XZ_DEFAULTS ?= "--memlimit=${XZ_MEMLIMIT}
>> --threads=${XZ_THREADS}"
>> XZ_DEFAULTS[vardepsexclude] += "XZ_MEMLIMIT XZ_THREADS"
>> # Default parallelism for zstd
>> -ZSTD_THREADS ?= "${@oe.utils.cpu_count(at_least=2)}"
>> +ZSTD_THREADS ?= "${@int(oe.utils.cpu_count(at_least=4)/2)}"
>
> Then why not just limit it for the large setups you are referring to in the
> example, for instance like
>
> ZSTD_THREADS ?= "${@min(int(oe.utils.cpu_count(at_least=4)), <insert a sane
> value of your choice>)}"
This sounds like a good choice.
>
> BTW this can be also done in your local.conf - as Alex already said, there is
Set it in my local.conf can make it work, but it isn't good for oe-core's OOBE
since the issue still exists.
> simply no reason to make it slower for everyone, while also half the threads of
The whole build contains a lot of tasks, for lower cpu cores, the total
resources are fixed, so when zstd uses less mem, other tasks can use more.
Limit zstd's thread doesn't make the build slower, but faster in my testing,
it would be great if you can help test it. The simple testing commands are:
# Make everything ready:
$ bitbake linux-yocto
# Before the patch, set ZSTD_THREADS to 128 and run 6 times:
$ for i in `seq 0 5`; do time bitbake linux-yocto -cpackage_write_rpm -f >
before_$i.log; done
Note, the time will be printed on the screen, not the before.log, the before.log
is for strip the logs and then we can read the time easier.
What I get is:
real 2m12.079s
real 2m0.177s
real 1m52.426s
real 2m3.396s
real 2m16.018s
real 1m58.595s
Drop the first build time since it *may* contain parsing time, and for the last
five builds:
Total: 609 seconds
Average: 609 / 5.0 = 121.8
# After the patch, set ZSTD_THREADS to 64, and run 6 times:
$ for i in `seq 0 5`; do time bitbake linux-yocto -cpackage_write_rpm -f >
after_$i.log; done
What I get is:
real 1m50.017s
real 1m50.400s
real 1m53.174s
real 2m4.817s
real 1m53.476s
real 1m56.794s
Drop the first build time since it *may* contain parsing time, and for the last
five builds:
Total: 576 seconds
Average: 576 / 5.0 = 115.2
So the smaller number is faster than the larger one.
// Robert
> a 128 core machine could be a trouble some setup.
>
> Last time I had this issue (with XZ back then) I used
> "${@min(int(oe.utils.cpu_count(at_least=4)), 20}"
>
>> ZSTD_THREADS[vardepvalue] = "1"
>> # Limit the number of threads that OpenMP libraries will use. Otherwise they
>>
>>
>>
>> -=-=-=-=-=-=-=-=-=-=-=-
>> Links: You receive all messages sent to this group.
>> View/Reply Online (#157998):
>> https://lists.openembedded.org/g/openembedded-core/message/157998
>> Mute This Topic: https://lists.openembedded.org/mt/86926962/3647476
>> Group Owner: openembedded-core+owner@lists.openembedded.org
>> Unsubscribe: https://lists.openembedded.org/g/openembedded-core/unsub
>> [kweihmann@outlook.com]
>> -=-=-=-=-=-=-=-=-=-=-=-
>>
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: [OE-core] [PATCH 1/1] bitbake.conf: Set ZSTD_THREADS to half of cpu number
2021-11-09 9:40 ` Robert Yang
@ 2021-11-09 9:44 ` Alexander Kanavin
2021-11-09 9:51 ` Robert Yang
0 siblings, 1 reply; 12+ messages in thread
From: Alexander Kanavin @ 2021-11-09 9:44 UTC (permalink / raw)
To: Robert Yang; +Cc: Konrad Weihmann, OE-core
[-- Attachment #1: Type: text/plain, Size: 4374 bytes --]
Maybe, but once we start doing tweaks like this, where do they stop? Hey,
I'd like to limit llvm and webkit threads too, they eat disproportionally
large amounts of RAM compared to everything else! I'd rather err on the
side of simple, striaghtforward, universal defaults, and having better
documentation for tweaking system resource consumption. Each build system
is different.
Alex
On Tue, 9 Nov 2021 at 10:40, Robert Yang <liezhi.yang@windriver.com> wrote:
>
>
> On 11/9/21 4:41 PM, Konrad Weihmann wrote:
> >
> >
> > On 09.11.21 09:48, Robert Yang wrote:
> >> The original value is very easy to cause do_packge error when cpu
> number is
> >> larger, for example, 128 cores and 512G mem:
> >>
> >> error: create archive failed: cpio: write failed - Cannot allocate
> memory"
> >>
> >> Set the ZSTD_THREADS to half of the CPU number can avoid the error in my
> >> testing.
> >>
> >> Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
> >> ---
> >> meta/conf/bitbake.conf | 2 +-
> >> 1 file changed, 1 insertion(+), 1 deletion(-)
> >>
> >> diff --git a/meta/conf/bitbake.conf b/meta/conf/bitbake.conf
> >> index 71c1e52ad6..46ebf5113f 100644
> >> --- a/meta/conf/bitbake.conf
> >> +++ b/meta/conf/bitbake.conf
> >> @@ -833,7 +833,7 @@ XZ_DEFAULTS ?= "--memlimit=${XZ_MEMLIMIT}
> >> --threads=${XZ_THREADS}"
> >> XZ_DEFAULTS[vardepsexclude] += "XZ_MEMLIMIT XZ_THREADS"
> >> # Default parallelism for zstd
> >> -ZSTD_THREADS ?= "${@oe.utils.cpu_count(at_least=2)}"
> >> +ZSTD_THREADS ?= "${@int(oe.utils.cpu_count(at_least=4)/2)}"
> >
> > Then why not just limit it for the large setups you are referring to in
> the
> > example, for instance like
> >
> > ZSTD_THREADS ?= "${@min(int(oe.utils.cpu_count(at_least=4)), <insert a
> sane
> > value of your choice>)}"
>
> This sounds like a good choice.
>
> >
> > BTW this can be also done in your local.conf - as Alex already said,
> there is
>
> Set it in my local.conf can make it work, but it isn't good for oe-core's
> OOBE
> since the issue still exists.
>
> > simply no reason to make it slower for everyone, while also half the
> threads of
>
> The whole build contains a lot of tasks, for lower cpu cores, the total
> resources are fixed, so when zstd uses less mem, other tasks can use more.
>
> Limit zstd's thread doesn't make the build slower, but faster in my
> testing,
> it would be great if you can help test it. The simple testing commands are:
>
> # Make everything ready:
> $ bitbake linux-yocto
>
> # Before the patch, set ZSTD_THREADS to 128 and run 6 times:
> $ for i in `seq 0 5`; do time bitbake linux-yocto -cpackage_write_rpm -f >
> before_$i.log; done
>
> Note, the time will be printed on the screen, not the before.log, the
> before.log
> is for strip the logs and then we can read the time easier.
>
> What I get is:
> real 2m12.079s
> real 2m0.177s
> real 1m52.426s
> real 2m3.396s
> real 2m16.018s
> real 1m58.595s
>
> Drop the first build time since it *may* contain parsing time, and for the
> last
> five builds:
>
> Total: 609 seconds
> Average: 609 / 5.0 = 121.8
>
>
> # After the patch, set ZSTD_THREADS to 64, and run 6 times:
> $ for i in `seq 0 5`; do time bitbake linux-yocto -cpackage_write_rpm -f >
> after_$i.log; done
>
> What I get is:
> real 1m50.017s
> real 1m50.400s
> real 1m53.174s
> real 2m4.817s
> real 1m53.476s
> real 1m56.794s
>
> Drop the first build time since it *may* contain parsing time, and for the
> last
> five builds:
>
> Total: 576 seconds
> Average: 576 / 5.0 = 115.2
>
> So the smaller number is faster than the larger one.
>
> // Robert
>
> > a 128 core machine could be a trouble some setup.
> >
> > Last time I had this issue (with XZ back then) I used
> > "${@min(int(oe.utils.cpu_count(at_least=4)), 20}"
> >
> >> ZSTD_THREADS[vardepvalue] = "1"
> >> # Limit the number of threads that OpenMP libraries will use.
> Otherwise they
> >>
> >>
> >>
> >>
> >>
>
> -=-=-=-=-=-=-=-=-=-=-=-
> Links: You receive all messages sent to this group.
> View/Reply Online (#158004):
> https://lists.openembedded.org/g/openembedded-core/message/158004
> Mute This Topic: https://lists.openembedded.org/mt/86926962/1686489
> Group Owner: openembedded-core+owner@lists.openembedded.org
> Unsubscribe: https://lists.openembedded.org/g/openembedded-core/unsub [
> alex.kanavin@gmail.com]
> -=-=-=-=-=-=-=-=-=-=-=-
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>
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^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: [OE-core] [PATCH 1/1] bitbake.conf: Set ZSTD_THREADS to half of cpu number
2021-11-09 8:21 ` [OE-core] " Alexander Kanavin
@ 2021-11-09 9:45 ` Robert Yang
0 siblings, 0 replies; 12+ messages in thread
From: Robert Yang @ 2021-11-09 9:45 UTC (permalink / raw)
To: Alexander Kanavin; +Cc: OE-core
Hi Alexander,
On 11/9/21 4:21 PM, Alexander Kanavin wrote:
> But does this mean we need to globally restrict this and make things twice
> slower for everyone? I'm not sure.
Please see my reply to Konrad, it doesn't cause any slower, but faster in my
testing.
BTW, the XZ_MEMLIMIT is 50% for command xz, but there isn't a similar option for
zstd, so I have to limit ZSTD_THREADS.
// Robert
>
>
> Alex
>
> On Tue, 9 Nov 2021 at 09:12, Robert Yang <liezhi.yang@windriver.com
> <mailto:liezhi.yang@windriver.com>> wrote:
>
> The original value is very easy to cause do_packge error when cpu number is
> larger, for example, 128 cores and 512G mem:
>
> error: create archive failed: cpio: write failed - Cannot allocate memory"
>
> Set the ZSTD_THREADS to half of the CPU number can avoid the error in my
> testing.
>
> Signed-off-by: Robert Yang <liezhi.yang@windriver.com
> <mailto:liezhi.yang@windriver.com>>
> ---
> meta/conf/bitbake.conf | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/meta/conf/bitbake.conf b/meta/conf/bitbake.conf
> index 71c1e52ad6..46ebf5113f 100644
> --- a/meta/conf/bitbake.conf
> +++ b/meta/conf/bitbake.conf
> @@ -833,7 +833,7 @@ XZ_DEFAULTS ?= "--memlimit=${XZ_MEMLIMIT}
> --threads=${XZ_THREADS}"
> XZ_DEFAULTS[vardepsexclude] += "XZ_MEMLIMIT XZ_THREADS"
>
> # Default parallelism for zstd
> -ZSTD_THREADS ?= "${@oe.utils.cpu_count(at_least=2)}"
> +ZSTD_THREADS ?= "${@int(oe.utils.cpu_count(at_least=4)/2)}"
> ZSTD_THREADS[vardepvalue] = "1"
>
> # Limit the number of threads that OpenMP libraries will use. Otherwise they
> --
> 2.17.1
>
>
> -=-=-=-=-=-=-=-=-=-=-=-
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> -=-=-=-=-=-=-=-=-=-=-=-
>
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: [OE-core] [PATCH 1/1] bitbake.conf: Set ZSTD_THREADS to half of cpu number
2021-11-09 9:44 ` Alexander Kanavin
@ 2021-11-09 9:51 ` Robert Yang
2021-11-09 9:56 ` Alexander Kanavin
0 siblings, 1 reply; 12+ messages in thread
From: Robert Yang @ 2021-11-09 9:51 UTC (permalink / raw)
To: Alexander Kanavin; +Cc: Konrad Weihmann, OE-core
Hi Alexander,
On 11/9/21 5:44 PM, Alexander Kanavin wrote:
> Maybe, but once we start doing tweaks like this, where do they stop? Hey, I'd
I think that it's not only a performance tweak, but this should be considered as
a bug since it would be failed to build on powerful machine, which isn't good
for oe-core's user experience.
// Robert
> like to limit llvm and webkit threads too, they eat disproportionally large
> amounts of RAM compared to everything else! I'd rather err on the side of
> simple, striaghtforward, universal defaults, and having better documentation for
> tweaking system resource consumption. Each build system is different.
>
> Alex
>
> On Tue, 9 Nov 2021 at 10:40, Robert Yang <liezhi.yang@windriver.com
> <mailto:liezhi.yang@windriver.com>> wrote:
>
>
>
> On 11/9/21 4:41 PM, Konrad Weihmann wrote:
> >
> >
> > On 09.11.21 09:48, Robert Yang wrote:
> >> The original value is very easy to cause do_packge error when cpu number is
> >> larger, for example, 128 cores and 512G mem:
> >>
> >> error: create archive failed: cpio: write failed - Cannot allocate memory"
> >>
> >> Set the ZSTD_THREADS to half of the CPU number can avoid the error in my
> >> testing.
> >>
> >> Signed-off-by: Robert Yang <liezhi.yang@windriver.com
> <mailto:liezhi.yang@windriver.com>>
> >> ---
> >> meta/conf/bitbake.conf | 2 +-
> >> 1 file changed, 1 insertion(+), 1 deletion(-)
> >>
> >> diff --git a/meta/conf/bitbake.conf b/meta/conf/bitbake.conf
> >> index 71c1e52ad6..46ebf5113f 100644
> >> --- a/meta/conf/bitbake.conf
> >> +++ b/meta/conf/bitbake.conf
> >> @@ -833,7 +833,7 @@ XZ_DEFAULTS ?= "--memlimit=${XZ_MEMLIMIT}
> >> --threads=${XZ_THREADS}"
> >> XZ_DEFAULTS[vardepsexclude] += "XZ_MEMLIMIT XZ_THREADS"
> >> # Default parallelism for zstd
> >> -ZSTD_THREADS ?= "${@oe.utils.cpu_count(at_least=2)}"
> >> +ZSTD_THREADS ?= "${@int(oe.utils.cpu_count(at_least=4)/2)}"
> >
> > Then why not just limit it for the large setups you are referring to in the
> > example, for instance like
> >
> > ZSTD_THREADS ?= "${@min(int(oe.utils.cpu_count(at_least=4)), <insert a sane
> > value of your choice>)}"
>
> This sounds like a good choice.
>
> >
> > BTW this can be also done in your local.conf - as Alex already said,
> there is
>
> Set it in my local.conf can make it work, but it isn't good for oe-core's OOBE
> since the issue still exists.
>
> > simply no reason to make it slower for everyone, while also half the
> threads of
>
> The whole build contains a lot of tasks, for lower cpu cores, the total
> resources are fixed, so when zstd uses less mem, other tasks can use more.
>
> Limit zstd's thread doesn't make the build slower, but faster in my testing,
> it would be great if you can help test it. The simple testing commands are:
>
> # Make everything ready:
> $ bitbake linux-yocto
>
> # Before the patch, set ZSTD_THREADS to 128 and run 6 times:
> $ for i in `seq 0 5`; do time bitbake linux-yocto -cpackage_write_rpm -f >
> before_$i.log; done
>
> Note, the time will be printed on the screen, not the before.log, the before.log
> is for strip the logs and then we can read the time easier.
>
> What I get is:
> real 2m12.079s
> real 2m0.177s
> real 1m52.426s
> real 2m3.396s
> real 2m16.018s
> real 1m58.595s
>
> Drop the first build time since it *may* contain parsing time, and for the last
> five builds:
>
> Total: 609 seconds
> Average: 609 / 5.0 = 121.8
>
>
> # After the patch, set ZSTD_THREADS to 64, and run 6 times:
> $ for i in `seq 0 5`; do time bitbake linux-yocto -cpackage_write_rpm -f >
> after_$i.log; done
>
> What I get is:
> real 1m50.017s
> real 1m50.400s
> real 1m53.174s
> real 2m4.817s
> real 1m53.476s
> real 1m56.794s
>
> Drop the first build time since it *may* contain parsing time, and for the last
> five builds:
>
> Total: 576 seconds
> Average: 576 / 5.0 = 115.2
>
> So the smaller number is faster than the larger one.
>
> // Robert
>
> > a 128 core machine could be a trouble some setup.
> >
> > Last time I had this issue (with XZ back then) I used
> > "${@min(int(oe.utils.cpu_count(at_least=4)), 20}"
> >
> >> ZSTD_THREADS[vardepvalue] = "1"
> >> # Limit the number of threads that OpenMP libraries will use.
> Otherwise they
> >>
> >>
> >>
> >>
> >>
>
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^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: [OE-core] [PATCH 1/1] bitbake.conf: Set ZSTD_THREADS to half of cpu number
2021-11-09 9:51 ` Robert Yang
@ 2021-11-09 9:56 ` Alexander Kanavin
2021-11-09 10:26 ` Richard Purdie
0 siblings, 1 reply; 12+ messages in thread
From: Alexander Kanavin @ 2021-11-09 9:56 UTC (permalink / raw)
To: Robert Yang; +Cc: Konrad Weihmann, OE-core
[-- Attachment #1: Type: text/plain, Size: 819 bytes --]
On Tue, 9 Nov 2021 at 10:51, Robert Yang <liezhi.yang@windriver.com> wrote:
> > Maybe, but once we start doing tweaks like this, where do they stop?
> Hey, I'd
>
> I think that it's not only a performance tweak, but this should be
> considered as
> a bug since it would be failed to build on powerful machine, which isn't
> good
> for oe-core's user experience.
>
I managed to bring down a powerful machine just yesterday by building
webkit and llvm together at the same time. They together ate all the RAM,
and someone in the office had to go and reset the box.
Do I see it as a bug? Absolutely not: it's in fact my fault for not
ensuring system resource consumption doesn't overwhelm the machine. This is
the same: if you do not have RAM to match the cores on your specific rig,
add RAM or limit the threads.
Alex
[-- Attachment #2: Type: text/html, Size: 1251 bytes --]
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: [OE-core] [PATCH 1/1] bitbake.conf: Set ZSTD_THREADS to half of cpu number
2021-11-09 9:56 ` Alexander Kanavin
@ 2021-11-09 10:26 ` Richard Purdie
2021-11-11 4:09 ` Robert Yang
0 siblings, 1 reply; 12+ messages in thread
From: Richard Purdie @ 2021-11-09 10:26 UTC (permalink / raw)
To: Alexander Kanavin, Robert Yang; +Cc: Konrad Weihmann, OE-core
On Tue, 2021-11-09 at 10:56 +0100, Alexander Kanavin wrote:
> On Tue, 9 Nov 2021 at 10:51, Robert Yang <liezhi.yang@windriver.com> wrote:
> > > Maybe, but once we start doing tweaks like this, where do they stop? Hey,
> > I'd
> >
> > I think that it's not only a performance tweak, but this should be
> > considered
> > as
> > a bug since it would be failed to build on powerful machine, which isn't
> > good
> > for oe-core's user experience.
> >
>
>
> I managed to bring down a powerful machine just yesterday by building webkit
> and llvm together at the same time. They together ate all the RAM, and someone
> in the office had to go and reset the box.
> Do I see it as a bug? Absolutely not: it's in fact my fault for not ensuring
> system resource consumption doesn't overwhelm the machine. This is the same:
> if you do not have RAM to match the cores on your specific rig, add RAM or
> limit the threads.
I can see both sides of this. If we had a pool for all the threads and the
pieces of the system all used the same pool, it would work well as implemented.
Sadly the bitbake threads, the make processes and now the compression threads
are all separate.
We do see the autobuilder break due to load issues too and on that we have
scaled back some of the defaults but not ZSTD as yet that I recall.
As such I think limiting the upper value on number of threads may be a good
compromise, both for compression and maybe for parallel make too.
Cheers,
Richard
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: [OE-core] [PATCH 1/1] bitbake.conf: Set ZSTD_THREADS to half of cpu number
2021-11-09 10:26 ` Richard Purdie
@ 2021-11-11 4:09 ` Robert Yang
0 siblings, 0 replies; 12+ messages in thread
From: Robert Yang @ 2021-11-11 4:09 UTC (permalink / raw)
To: Richard Purdie, Alexander Kanavin; +Cc: Konrad Weihmann, OE-core
Hi RP,
On 11/9/21 6:26 PM, Richard Purdie wrote:
> On Tue, 2021-11-09 at 10:56 +0100, Alexander Kanavin wrote:
>> On Tue, 9 Nov 2021 at 10:51, Robert Yang <liezhi.yang@windriver.com> wrote:
>>>> Maybe, but once we start doing tweaks like this, where do they stop? Hey,
>>> I'd
>>>
>>> I think that it's not only a performance tweak, but this should be
>>> considered
>>> as
>>> a bug since it would be failed to build on powerful machine, which isn't
>>> good
>>> for oe-core's user experience.
>>>
>>
>>
>> I managed to bring down a powerful machine just yesterday by building webkit
>> and llvm together at the same time. They together ate all the RAM, and someone
>> in the office had to go and reset the box.
>> Do I see it as a bug? Absolutely not: it's in fact my fault for not ensuring
>> system resource consumption doesn't overwhelm the machine. This is the same:
>> if you do not have RAM to match the cores on your specific rig, add RAM or
>> limit the threads.
>
> I can see both sides of this. If we had a pool for all the threads and the
> pieces of the system all used the same pool, it would work well as implemented.
> Sadly the bitbake threads, the make processes and now the compression threads
> are all separate.
>
> We do see the autobuilder break due to load issues too and on that we have
> scaled back some of the defaults but not ZSTD as yet that I recall.
>
> As such I think limiting the upper value on number of threads may be a good
> compromise, both for compression and maybe for parallel make too.
What should we do next, please? Limit bb thread + parallel make + zstd thread?
Or just limit zstd's thread since other people may concern about the
performance.
// Robert
>
> Cheers,
>
> Richard
>
^ permalink raw reply [flat|nested] 12+ messages in thread
end of thread, other threads:[~2021-11-11 4:09 UTC | newest]
Thread overview: 12+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-11-09 8:48 [PATCH 0/1] bitbake.conf: Set ZSTD_THREADS to half of cpu number Robert Yang
2021-11-09 8:48 ` [PATCH 1/1] " Robert Yang
2021-11-09 8:21 ` [OE-core] " Alexander Kanavin
2021-11-09 9:45 ` Robert Yang
2021-11-09 8:41 ` Konrad Weihmann
2021-11-09 9:40 ` Robert Yang
2021-11-09 9:44 ` Alexander Kanavin
2021-11-09 9:51 ` Robert Yang
2021-11-09 9:56 ` Alexander Kanavin
2021-11-09 10:26 ` Richard Purdie
2021-11-11 4:09 ` Robert Yang
2021-11-09 8:45 ` Jose Quaresma
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