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| author | Dirk Mueller <dirk@dmllr.de> | 2018-10-04 14:37:25 +0200 |
|---|---|---|
| committer | Dirk Mueller <dirk@dmllr.de> | 2018-10-09 12:12:46 +0200 |
| commit | c0a86998203315858721a7b2c8ab75fbf5cd51d9 (patch) | |
| tree | e695fa226644d9b936a4140bdd9173c3e6bd94f5 /doc | |
| parent | 2ebda956b4318c86d27b3659ccce01abb73e0902 (diff) | |
| download | oslo-rootwrap-c0a86998203315858721a7b2c8ab75fbf5cd51d9.tar.gz | |
Run rootwrap with lower fd ulimit by default
On Python 2.x, a subprocess.Popen() with close_fds=True will
fork and then close filedescriptors range(3..os.sysconf("SC_OPEN_MAX")),
which thanks to Kernel PTI (Kaiser patches) is significantly slower
in 2018 when the range is very large. With a soft limit of 1048576,
benchmark.py reports an overhead of ~ 400ms without this patch and 2ms
with the patch applied. This patch adds a configuration option and
sets a more sensible default of 1024 file descriptor limit by default.
Closes-Bug: 1796267
Change-Id: Idd98c183eca3e2df8648fc0f37d27fe9cc6d0563
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/source/user/usage.rst | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/doc/source/user/usage.rst b/doc/source/user/usage.rst index 56f4bcb..bb11d5b 100644 --- a/doc/source/user/usage.rst +++ b/doc/source/user/usage.rst @@ -113,6 +113,14 @@ syslog_log_level unsuccessful attempts. Example: ``syslog_log_level=ERROR`` +rlimit_nofile + Which rlimit for number of open file descriptors should be set for rootwrap + and its children processes by default. This is useful in case there is a + excessively large ulimit configured for the calling process that shouldn't + inherit to oslo.rootwrap and its called processes. Will not attempt to raise + the limit. Defaults to 1024. + + .filters files ============== |