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authorLukas Larsson <[email protected]>2014-09-12 16:38:00 +0200
committerLukas Larsson <[email protected]>2016-02-02 10:45:21 +0100
commit664ed2a6fd2b324bb6b56db3d3eca853cfda8f61 (patch)
tree286743a4b1f794948329961e7f5879b5f54f54a5 /erts/configure.in
parenteea5f896780e07f7ca76685061d01e7be5a7abaa (diff)
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erts: Add microstate accounting
Microstate accounting is a way to track which state the different threads within ERTS are in. The main usage area is to pin point performance bottlenecks by checking which states the threads are in and then from there figuring out why and where to optimize. Since checking whether microstate accounting is on or off is relatively expensive if done in a short loop only a few of the states are enabled by default and more states can be enabled through configure. I've done some benchmarking and the overhead with it turned off is not noticible and with it on it is a fraction of a percent. If you enable the extra states, depending on the benchmark, the ovehead when turned off is about 1% and when turned on somewhere inbetween 5-15%. OTP-12345
Diffstat (limited to 'erts/configure.in')
-rw-r--r--erts/configure.in15
1 files changed, 15 insertions, 0 deletions
diff --git a/erts/configure.in b/erts/configure.in
index 2f19c0f760..d84651f4f9 100644
--- a/erts/configure.in
+++ b/erts/configure.in
@@ -342,6 +342,21 @@ AS_HELP_STRING([--disable-saved-compile-time], [disable saved compile time]),
AC_DEFINE_UNQUOTED(ERTS_SAVED_COMPILE_TIME, $save_compile_time, [Save compile time?])
+AC_ARG_WITH(microstate-accounting,
+AS_HELP_STRING([--with-microstate-accounting={yes|extra}],
+ [enable microstate account, possibly with extra detailed states])
+AS_HELP_STRING([--without-microstate-accounting],
+ [don't enable microstate accounting]),
+[],[with_microstate_accounting=yes])
+
+case "$with_microstate_accounting" in
+ yes) AC_DEFINE(ERTS_ENABLE_MSACC,[1],
+ [Define as 1 if you want to enable microstate accounting, 2 if you want extra states]) ;;
+ extra) AC_DEFINE(ERTS_ENABLE_MSACC,[2],
+ [Define as 1 if you want to enable microstate accounting, 2 if you want extra states]) ;;
+ *) ;;
+esac
+
dnl Magic test for clearcase.
OTP_RELEASE=
if test "${ERLANG_COMMERCIAL_BUILD}" != ""; then