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* [RFC PATCH lttng-tools] Bump default kernel, and UST per-uid/per-pid buffer size
@ 2017-03-31 14:04 Mathieu Desnoyers
  0 siblings, 0 replies; 2+ messages in thread
From: Mathieu Desnoyers @ 2017-03-31 14:04 UTC (permalink / raw)
  To: jgalar; +Cc: lttng-dev

LTTng with current default buffer size often lead to discarded events,
which is not something we want as a first user impression.

The choice of default buffer size were made conservatively around 2010.
Since then, the memory available on typical systems has increased, and
so has the amount of instrumentation available. As an example, the
mid-2010 Macbook Pro had 2GB ram. The current 2017 Macbook specification
states 8GB ram, for a 4-fold installed memory size increase.

Increase the kernel tracer buffer size from:
4 x 256kB per core
to:
4 x 1MB per core

Increase the UST tracer per-uid buffer size from:
4 x 128kB per core
to
4 x 512kB per core

Increase the UST tracer per-pid buffer size from:
4 x 4kB per core
to
4 x 16kB per core

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---
 configure.ac | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/configure.ac b/configure.ac
index 0a7034e..91a2d5e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -240,7 +240,7 @@ AC_DEFUN([_AC_DEFINE_QUOTED_AND_SUBST], [
 ])
 
 # Default values
-m4_define([_DEFAULT_CHANNEL_SUBBUF_SIZE], [4096])
+m4_define([_DEFAULT_CHANNEL_SUBBUF_SIZE], [16384])
 m4_define([_DEFAULT_CHANNEL_SUBBUF_NUM], [4])
 m4_define([_DEFAULT_CHANNEL_SWITCH_TIMER], [0])
 m4_define([_DEFAULT_CHANNEL_LIVE_TIMER], [0])
@@ -253,7 +253,7 @@ _AC_DEFINE_AND_SUBST([DEFAULT_CHANNEL_TRACEFILE_SIZE], [0])
 _AC_DEFINE_AND_SUBST([DEFAULT_KERNEL_CHANNEL_LIVE_TIMER], [_DEFAULT_CHANNEL_LIVE_TIMER])
 _AC_DEFINE_AND_SUBST([DEFAULT_KERNEL_CHANNEL_READ_TIMER], [_DEFAULT_CHANNEL_READ_TIMER])
 _AC_DEFINE_AND_SUBST([DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM], [_DEFAULT_CHANNEL_SUBBUF_NUM])
-_AC_DEFINE_AND_SUBST([DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE], [262144])
+_AC_DEFINE_AND_SUBST([DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE], [1048576])
 _AC_DEFINE_AND_SUBST([DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER], [_DEFAULT_CHANNEL_SWITCH_TIMER])
 _AC_DEFINE_AND_SUBST([DEFAULT_LTTNG_LIVE_TIMER], [1000000])
 _AC_DEFINE_AND_SUBST([DEFAULT_METADATA_CACHE_SIZE], [4096])
@@ -272,7 +272,7 @@ _AC_DEFINE_AND_SUBST([DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER], [_DEFAULT_CHANNEL_S
 _AC_DEFINE_AND_SUBST([DEFAULT_UST_UID_CHANNEL_LIVE_TIMER], [_DEFAULT_CHANNEL_LIVE_TIMER])
 _AC_DEFINE_AND_SUBST([DEFAULT_UST_UID_CHANNEL_READ_TIMER], [0])
 _AC_DEFINE_AND_SUBST([DEFAULT_UST_UID_CHANNEL_SUBBUF_NUM], [_DEFAULT_CHANNEL_SUBBUF_NUM])
-_AC_DEFINE_AND_SUBST([DEFAULT_UST_UID_CHANNEL_SUBBUF_SIZE], [131072])
+_AC_DEFINE_AND_SUBST([DEFAULT_UST_UID_CHANNEL_SUBBUF_SIZE], [524288])
 _AC_DEFINE_AND_SUBST([DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER], [_DEFAULT_CHANNEL_SWITCH_TIMER])
 _AC_DEFINE_QUOTED_AND_SUBST([DEFAULT_AGENT_BIND_ADDRESS], [localhost])
 _AC_DEFINE_QUOTED_AND_SUBST([DEFAULT_NETWORK_CONTROL_BIND_ADDRESS], [0.0.0.0])
-- 
2.1.4

_______________________________________________
lttng-dev mailing list
lttng-dev@lists.lttng.org
https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev

^ permalink raw reply related	[flat|nested] 2+ messages in thread
* Re: [RFC PATCH lttng-tools] Bump default kernel, and UST per-uid/per-pid buffer size
       [not found] <1490969060-10055-1-git-send-email-mathieu.desnoyers@efficios.com>
@ 2017-05-06 19:49 ` Jérémie Galarneau
  0 siblings, 0 replies; 2+ messages in thread
From: Jérémie Galarneau @ 2017-05-06 19:49 UTC (permalink / raw)
  To: Mathieu Desnoyers; +Cc: lttng-dev, Jeremie Galarneau

Merged, thanks!

Jérémie

On 31 March 2017 at 10:04, Mathieu Desnoyers
<mathieu.desnoyers@efficios.com> wrote:
> LTTng with current default buffer size often lead to discarded events,
> which is not something we want as a first user impression.
>
> The choice of default buffer size were made conservatively around 2010.
> Since then, the memory available on typical systems has increased, and
> so has the amount of instrumentation available. As an example, the
> mid-2010 Macbook Pro had 2GB ram. The current 2017 Macbook specification
> states 8GB ram, for a 4-fold installed memory size increase.
>
> Increase the kernel tracer buffer size from:
> 4 x 256kB per core
> to:
> 4 x 1MB per core
>
> Increase the UST tracer per-uid buffer size from:
> 4 x 128kB per core
> to
> 4 x 512kB per core
>
> Increase the UST tracer per-pid buffer size from:
> 4 x 4kB per core
> to
> 4 x 16kB per core
>
> Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
> ---
>  configure.ac | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/configure.ac b/configure.ac
> index 0a7034e..91a2d5e 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -240,7 +240,7 @@ AC_DEFUN([_AC_DEFINE_QUOTED_AND_SUBST], [
>  ])
>
>  # Default values
> -m4_define([_DEFAULT_CHANNEL_SUBBUF_SIZE], [4096])
> +m4_define([_DEFAULT_CHANNEL_SUBBUF_SIZE], [16384])
>  m4_define([_DEFAULT_CHANNEL_SUBBUF_NUM], [4])
>  m4_define([_DEFAULT_CHANNEL_SWITCH_TIMER], [0])
>  m4_define([_DEFAULT_CHANNEL_LIVE_TIMER], [0])
> @@ -253,7 +253,7 @@ _AC_DEFINE_AND_SUBST([DEFAULT_CHANNEL_TRACEFILE_SIZE], [0])
>  _AC_DEFINE_AND_SUBST([DEFAULT_KERNEL_CHANNEL_LIVE_TIMER], [_DEFAULT_CHANNEL_LIVE_TIMER])
>  _AC_DEFINE_AND_SUBST([DEFAULT_KERNEL_CHANNEL_READ_TIMER], [_DEFAULT_CHANNEL_READ_TIMER])
>  _AC_DEFINE_AND_SUBST([DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM], [_DEFAULT_CHANNEL_SUBBUF_NUM])
> -_AC_DEFINE_AND_SUBST([DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE], [262144])
> +_AC_DEFINE_AND_SUBST([DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE], [1048576])
>  _AC_DEFINE_AND_SUBST([DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER], [_DEFAULT_CHANNEL_SWITCH_TIMER])
>  _AC_DEFINE_AND_SUBST([DEFAULT_LTTNG_LIVE_TIMER], [1000000])
>  _AC_DEFINE_AND_SUBST([DEFAULT_METADATA_CACHE_SIZE], [4096])
> @@ -272,7 +272,7 @@ _AC_DEFINE_AND_SUBST([DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER], [_DEFAULT_CHANNEL_S
>  _AC_DEFINE_AND_SUBST([DEFAULT_UST_UID_CHANNEL_LIVE_TIMER], [_DEFAULT_CHANNEL_LIVE_TIMER])
>  _AC_DEFINE_AND_SUBST([DEFAULT_UST_UID_CHANNEL_READ_TIMER], [0])
>  _AC_DEFINE_AND_SUBST([DEFAULT_UST_UID_CHANNEL_SUBBUF_NUM], [_DEFAULT_CHANNEL_SUBBUF_NUM])
> -_AC_DEFINE_AND_SUBST([DEFAULT_UST_UID_CHANNEL_SUBBUF_SIZE], [131072])
> +_AC_DEFINE_AND_SUBST([DEFAULT_UST_UID_CHANNEL_SUBBUF_SIZE], [524288])
>  _AC_DEFINE_AND_SUBST([DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER], [_DEFAULT_CHANNEL_SWITCH_TIMER])
>  _AC_DEFINE_QUOTED_AND_SUBST([DEFAULT_AGENT_BIND_ADDRESS], [localhost])
>  _AC_DEFINE_QUOTED_AND_SUBST([DEFAULT_NETWORK_CONTROL_BIND_ADDRESS], [0.0.0.0])
> --
> 2.1.4
>



-- 
Jérémie Galarneau
EfficiOS Inc.
http://www.efficios.com
_______________________________________________
lttng-dev mailing list
lttng-dev@lists.lttng.org
https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev

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2017-03-31 14:04 [RFC PATCH lttng-tools] Bump default kernel, and UST per-uid/per-pid buffer size Mathieu Desnoyers
     [not found] <1490969060-10055-1-git-send-email-mathieu.desnoyers@efficios.com>
2017-05-06 19:49 ` Jérémie Galarneau

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