* Cache timings with various changes
@ 2022-11-23 0:07 Richard Purdie
2022-11-23 4:33 ` [bitbake-devel] " Peter Kjellerstedt
0 siblings, 1 reply; 3+ messages in thread
From: Richard Purdie @ 2022-11-23 0:07 UTC (permalink / raw)
To: bitbake-devel; +Cc: Joshua Watt
I've talked about changing the data we cache in various forums. These
are some actual numbers from a local system (88 core):
Patch Full reparse time Cache load time Cache size (compressed) Cache size (uncompressed)
----- ----------------- --------------- ----------------------- -------------------------
master baseline 5.732s 2.261s N/A 24M
frozenset changes 4.326s 2.289s N/A 24M
pickle in one 4.509s 2.177s N/A 24M
compress with zstd 6.040s 2.204s 3.4M 24M
add hash data to cache 9.693s 4.327s 17M 83M
It seems the frozenset improvements I have speed things up nicely and
look like a good change. The compression does slow things down, as does
pickling the cache in one go.
The patches are in poky-contrib rpurdie/t222. I'll post the frozenset
one, the others look like they need more thought.
Cheers,
Richard
^ permalink raw reply [flat|nested] 3+ messages in thread
* RE: [bitbake-devel] Cache timings with various changes
2022-11-23 0:07 Cache timings with various changes Richard Purdie
@ 2022-11-23 4:33 ` Peter Kjellerstedt
2022-11-23 12:24 ` Richard Purdie
0 siblings, 1 reply; 3+ messages in thread
From: Peter Kjellerstedt @ 2022-11-23 4:33 UTC (permalink / raw)
To: Richard Purdie, bitbake-devel; +Cc: Joshua Watt
> -----Original Message-----
> From: bitbake-devel@lists.openembedded.org <bitbake-devel@lists.openembedded.org> On Behalf Of Richard Purdie
> Sent: den 23 november 2022 01:07
> To: bitbake-devel <bitbake-devel@lists.openembedded.org>
> Cc: Joshua Watt <JPEWhacker@gmail.com>
> Subject: [bitbake-devel] Cache timings with various changes
>
> I've talked about changing the data we cache in various forums. These
> are some actual numbers from a local system (88 core):
>
> Patch Full reparse time Cache load time Cache size (compressed) Cache size (uncompressed)
> ----- ----------------- --------------- ----------------------- -------------------------
> master baseline 5.732s 2.261s N/A 24M
> frozenset changes 4.326s 2.289s N/A 24M
> pickle in one 4.509s 2.177s N/A 24M
> compress with zstd 6.040s 2.204s 3.4M 24M
> add hash data to cache 9.693s 4.327s 17M 83M
>
> It seems the frozenset improvements I have speed things up nicely and
> look like a good change. The compression does slow things down, as does
> pickling the cache in one go.
>
> The patches are in poky-contrib rpurdie/t222. I'll post the frozenset
> one, the others look like they need more thought.
>
> Cheers,
>
> Richard
Not sure how you measured the times, so I just looked at the progress bars
for "Loading cache" and "Parsing recipes". With our layers (4717 recipes)
and my computer with 8 cores (16 threads), this is what I got:
* Without rpurdie/t222 applied, it takes 0-2 s to load the cache, it takes
43-46 s to parse the recipes and the cache is 185 MB.
* After applying up to "cache: Switch to compressing the cache file with
zstd", the cache load and recipe parse times remains the same, but the
size of the cache decreases to 17 MB
* With all of rpurdie/t222 applied it takes 2-3 to load the cache, 51-53 s
to parse the recipes and the cache is 55 MB.
//Peter
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [bitbake-devel] Cache timings with various changes
2022-11-23 4:33 ` [bitbake-devel] " Peter Kjellerstedt
@ 2022-11-23 12:24 ` Richard Purdie
0 siblings, 0 replies; 3+ messages in thread
From: Richard Purdie @ 2022-11-23 12:24 UTC (permalink / raw)
To: Peter Kjellerstedt, bitbake-devel; +Cc: Joshua Watt
On Wed, 2022-11-23 at 04:33 +0000, Peter Kjellerstedt wrote:
> > -----Original Message-----
> > From: bitbake-devel@lists.openembedded.org <bitbake-devel@lists.openembedded.org> On Behalf Of Richard Purdie
> > Sent: den 23 november 2022 01:07
> > To: bitbake-devel <bitbake-devel@lists.openembedded.org>
> > Cc: Joshua Watt <JPEWhacker@gmail.com>
> > Subject: [bitbake-devel] Cache timings with various changes
> >
> > I've talked about changing the data we cache in various forums. These
> > are some actual numbers from a local system (88 core):
> >
> > Patch Full reparse time Cache load time Cache size (compressed) Cache size (uncompressed)
> > ----- ----------------- --------------- ----------------------- -------------------------
> > master baseline 5.732s 2.261s N/A 24M
> > frozenset changes 4.326s 2.289s N/A 24M
> > pickle in one 4.509s 2.177s N/A 24M
> > compress with zstd 6.040s 2.204s 3.4M 24M
> > add hash data to cache 9.693s 4.327s 17M 83M
> >
> > It seems the frozenset improvements I have speed things up nicely and
> > look like a good change. The compression does slow things down, as does
> > pickling the cache in one go.
> >
> > The patches are in poky-contrib rpurdie/t222. I'll post the frozenset
> > one, the others look like they need more thought.
> >
> > Cheers,
> >
> > Richard
>
> Not sure how you measured the times, so I just looked at the progress bars
> for "Loading cache" and "Parsing recipes".
The numbers are from:
https://git.yoctoproject.org/poky-contrib/commit/?h=rpurdie/t222&id=3f3c3f5df43097ee4539308e6f06d838bbd69f40
i.e. "time bitbake -p" with a hot/cold cache. In that sense they're the
real world numbers a user sees.
> With our layers (4717 recipes)
> and my computer with 8 cores (16 threads), this is what I got:
>
> * Without rpurdie/t222 applied, it takes 0-2 s to load the cache, it takes
> 43-46 s to parse the recipes and the cache is 185 MB.
> * After applying up to "cache: Switch to compressing the cache file with
> zstd", the cache load and recipe parse times remains the same, but the
> size of the cache decreases to 17 MB
> * With all of rpurdie/t222 applied it takes 2-3 to load the cache, 51-53 s
> to parse the recipes and the cache is 55 MB.
That is useful data, thanks! It seems to agree with my estimate that
the patch slows down main parsing by a few seconds (probably something
we could live with) and doubles the hot cache load time (not so good).
Cheers,
Richard
^ permalink raw reply [flat|nested] 3+ messages in thread
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2022-11-23 0:07 Cache timings with various changes Richard Purdie
2022-11-23 4:33 ` [bitbake-devel] " Peter Kjellerstedt
2022-11-23 12:24 ` Richard Purdie
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