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scripts/kvm/kvm_stat: Set sensible no. files rlimit 

As num cpus * 1000 is NOT a sensible rlimit, we need to calculate a
more accurate rlimit.

The number of open files is directly dependent on the cpu count and on
the number of trace points per cpu. A additional constant works as a
buffer for files that are needed by python or do get opened when the
script runs.

Hence we have:
      cpus * traces + constant

Reviewed-by: Jason J. Herne <jjherne@linux.vnet.ibm.com>
Signed-off-by: Janosch Frank <frankja@linux.vnet.ibm.com>
Message-Id: <1452525484-32309-15-git-send-email-frankja@linux.vnet.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Janosch Frank 2016-01-11 16:17:44 +01:00 committed by Paolo Bonzini
parent 400b3cb519
commit 392a7fa3ca
1 changed files with 9 additions and 2 deletions
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11
scripts/kvm/kvm_stat
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@ -395,8 +395,15 @@ class TracepointProvider(object):
def _setup(self, _fields): def _setup(self, _fields):
self._fields = _fields self._fields = _fields
cpus = self._online_cpus() cpus = self._online_cpus()
nfiles = len(cpus) * 1000
resource.setrlimit(resource.RLIMIT_NOFILE, (nfiles, nfiles)) # The constant is needed as a buffer for python libs, std
# streams and other files that the script opens.
rlimit = len(cpus) * len(_fields) + 50
try:
resource.setrlimit(resource.RLIMIT_NOFILE, (rlimit, rlimit))
except ValueError:
sys.exit("NOFILE rlimit could not be raised to {0}".format(rlimit))
events = [] events = []
self.group_leaders = [] self.group_leaders = []
for cpu in cpus: for cpu in cpus: