From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
To: jgalar@efficios.com
Cc: lttng-dev@lists.lttng.org
Subject: [RFC PATCH lttng-tools] Bump default kernel, and UST per-uid/per-pid buffer size
Date: Fri, 31 Mar 2017 10:04:20 -0400 [thread overview]
Message-ID: <1490969060-10055-1-git-send-email-mathieu.desnoyers__19333.6653792814$1490969086$gmane$org@efficios.com> (raw)
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
next reply other threads:[~2017-03-31 14:04 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-31 14:04 Mathieu Desnoyers [this message]
[not found] <1490969060-10055-1-git-send-email-mathieu.desnoyers@efficios.com>
2017-05-06 19:49 ` [RFC PATCH lttng-tools] Bump default kernel, and UST per-uid/per-pid buffer size Jérémie Galarneau
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='1490969060-10055-1-git-send-email-mathieu.desnoyers__19333.6653792814$1490969086$gmane$org@efficios.com' \
--to=mathieu.desnoyers@efficios.com \
--cc=jgalar@efficios.com \
--cc=lttng-dev@lists.lttng.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.