Bug 1203025 - Perf: Throughput falls to 0 and CPU spikes during smallfile tests.
Summary: Perf: Throughput falls to 0 and CPU spikes during smallfile tests.
Keywords:
Status: CLOSED WORKSFORME
Alias: None
Product: Red Hat Gluster Storage
Classification: Red Hat Storage
Component: core
Version: rhgs-3.0
Hardware: x86_64
OS: Linux
high
high
Target Milestone: ---
: ---
Assignee: Bug Updates Notification Mailing List
QA Contact: Ben Turner
URL:
Whiteboard: dht-smallfile-perf, dht-pm-query
Depends On:
Blocks: 1202842
TreeView+ depends on / blocked
 
Reported: 2015-03-17 23:16 UTC by Ben Turner
Modified: 2021-09-09 12:58 UTC (History)
12 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2018-01-29 17:38:58 UTC
Embargoed:

Attachments (Terms of Use)

Description Ben Turner 2015-03-17 23:16:57 UTC 
Description of problem:

During smallfile tests glusterfs throughput to the local brick falls to 0 and CPU spikes.  Gluster appears to be choking on something when the CPU spikes and throughput drops to 0.

Version-Release number of selected component (if applicable):

glusterfs 3.6.0.52

How reproducible:

Everytime.

Steps to Reproduce:
1.  Run a smallfile test.
2.  Watch iostat
3.  See MB / sec drop and CPU spike

Actual results:

Drops in throughput and CPU spikes.

Expected results:

More sustained throughput to the bricks as the long periods of little to no throughput really hurts MB / sec.

Additional info:
Comment 11 Amar Tumballi 2018-01-29 17:38:58 UTC 
Have not seen the issue in last 2+ years of perf testing. Please feel free to reopen if seen again with latest versions.
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