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 <[email protected]> --- 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 [email protected] https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
