Project

General

Profile

Bug #4370

mds: high-cpu utilization in memorymodel:_sample

Added by Noah Watkins about 11 years ago. Updated over 7 years ago.

Status:
New
Priority:
Normal
Assignee:
-
Category:
Performance/Resource Usage
Target version:
-
% Done:

0%

Source:
Development
Tags:
Backport:
Regression:
Severity:
3 - minor
Reviewed:
Affected Versions:
ceph-qa-suite:
Component(FS):
MDS
Labels (FS):
Pull request ID:
Crash signature (v1):
Crash signature (v2):

Description

Shortly after running some fs workloads on a 1-mds/16-osd cluster, cpu utilization spikes and never returns to normal. This patch takes care of the issue, but probably isn't the real fix.

diff --git a/src/mds/MDCache.cc b/src/mds/MDCache.cc
index c85627a..1d3ff71 100644
--- a/src/mds/MDCache.cc
+++ b/src/mds/MDCache.cc
@@ -6423,6 +6423,7 @@ void MDCache::trim_client_leases()

 void MDCache::check_memory_usage()
 {
+  return;
   static MemoryModel mm(g_ceph_context);
   static MemoryModel::snap last;
   mm.sample(&last);

History

#1 Updated by Greg Farnum about 10 years ago

  • Priority changed from Normal to High

Figure out if the current MemoryModel is actually useful for anything — I think it might not be. All the lovely tickets to make it useful will sadly have to wait.

#2 Updated by Sage Weil over 9 years ago

  • Priority changed from High to Normal

#3 Updated by Greg Farnum over 7 years ago

  • Category set to Performance/Resource Usage
  • Component(FS) MDS added

Also available in: Atom PDF