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| author | Lukas Larsson <[email protected]> | 2016-02-02 17:17:46 +0100 |
|---|---|---|
| committer | Lukas Larsson <[email protected]> | 2016-02-02 17:17:46 +0100 |
| commit | 246927d866b7de938cc58c95498f54b03869cbe5 (patch) | |
| tree | 63c4846a861aec6051b4f31aa1c5f5186802855a /lib/kernel/doc/src/os.xml | |
| parent | f45b817d0da8f9f61d2241d4f0eb06e47a6be86a (diff) | |
| parent | f12da3c4abe70bd932484895af6e23436b308f53 (diff) | |
| download | otp-246927d866b7de938cc58c95498f54b03869cbe5.tar.gz otp-246927d866b7de938cc58c95498f54b03869cbe5.tar.bz2 otp-246927d866b7de938cc58c95498f54b03869cbe5.zip | |
Merge branch 'lukas/erts/msacc'
* lukas/erts/msacc:
Update preloaded modules
erts: Make msacc alloctor type thread safe
Silence compiler
erts: Fix msacc testcase on some windowses
erts: Add power saving cpu feature tests and use them
erts: Refactor perf counter internal interface
erts: Add rdtscp instruction check
erts: Fix hrtime for windows
erts: use correct function for perf counter on non-x86
erts: Fix msacc win32 debug compile error
erts: Add microstate accounting
erts, kernel: Add os:perf_counter function
erts: Add ERTS_WRITE_UNLIKELY
Diffstat (limited to 'lib/kernel/doc/src/os.xml')
| -rw-r--r-- | lib/kernel/doc/src/os.xml | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/lib/kernel/doc/src/os.xml b/lib/kernel/doc/src/os.xml index 682d4a2eac..165160a909 100644 --- a/lib/kernel/doc/src/os.xml +++ b/lib/kernel/doc/src/os.xml @@ -37,6 +37,7 @@ use these functions can be of help in enabling a program to run on most platforms.</p> </description> + <funcs> <func> <name name="cmd" arity="1"/> @@ -210,6 +211,30 @@ format_utc_timestamp() -> </desc> </func> <func> + <name name="perf_counter" arity="0"/> + <fsummary>Returns a performance counter</fsummary> + <desc> + <p>Returns the current performance counter value in <c>perf_counter</c> + <seealso marker="erts:erlang#type_time_unit">time unit</seealso>. + This is a highly optimized call that might not be traceable. + </p> + </desc> + </func> + <func> + <name name="perf_counter" arity="1"/> + <fsummary>Returns a performance counter</fsummary> + <desc><p>Returns a performance counter that can be used as a very fast and + high resolution timestamp. This counter is read directly from the hardware or operating + system with the same guarantees. This means that two consecutive calls + to the function are not guaranteed to be monotonic, though it most likely will be. + The performance counter till be converted to the resolution passed as an argument.</p> + <pre>1> <input>T1 = os:perf_counter(1000),receive after 10000 -> ok end,T2 = os:perf_counter(1000).</input> +176525861 +2> <input>T2 - T1.</input> +10004</pre> + </desc> + </func> + <func> <name name="type" arity="0"/> <fsummary>Return the OS family and, in some cases, OS name of the current operating system</fsummary> <desc> |