[SERVER-14461] Lock percentage reported by mongostat exceeds 100% Created: 03/Jul/14  Updated: 06/Dec/22  Resolved: 08/Dec/16

Status: Closed
Project: Core Server
Component/s: Diagnostics
Affects Version/s: 2.6.3
Fix Version/s: None

Type: Bug Priority: Major - P3
Reporter: Davide Italiano Assignee: Backlog - Storage Execution Team
Resolution: Duplicate Votes: 0
Labels: 28qa
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified
Environment:

Linux localhost.localdomain 3.14.4-200.fc20.x86_64 #1 SMP Tue May 13 13:51:08 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux


Issue Links:
Duplicate
duplicates TOOLS-1154 Mongostat locked % goes above 100% Closed
Assigned Teams:
Storage Execution
Operating System: ALL
Participants:

 Description   

During the insert phase of LinkBench load it's about 130%:

 84234     *0   1028     *0       0     1|0       0   544m  1.36g   269m      0 linkdb:128.0%          0       4|0     0|1     6m    85k     9   15:23:40 
 93348     *0    589     *0       0     1|0       0   544m  1.36g   282m      0 linkdb:131.0%          0       3|0     0|1     7m    55k     9   15:23:41 
 92694     *0    448     *0       0     1|0       0   544m  1.36g   296m      0 linkdb:134.0%          0       3|0     0|1     7m    45k     9   15:23:42 
 91196     *0    335     *0       0     9|0       0   544m  1.36g   309m      0 linkdb:134.3%          0       1|0     0|1     7m    40k     9   15:23:43 
 93050     *0    366     *0       0     1|0       0   544m  1.36g   324m      0 linkdb:132.9%          0       3|0     0|1     7m    39k     9   15:23:44 
 88198     *0    806     *0       0     1|0       0   544m  1.36g   337m      0 linkdb:130.9%          0       1|0     0|1     7m    70k     9   15:23:45 
 92160     *0    805     *0       0     1|0       0   544m  1.36g   350m      0 linkdb:129.7%          0       1|0     0|1     7m    70k     9   15:23:46 
 90088     *0    473     *0       0     1|0       0   544m  1.36g   363m      1 linkdb:135.1%          0       3|1     0|1     7m    46k     9   15:23:47 
 90136      3    453     *0       0     9|0       0   544m  1.36g   377m      0 linkdb:134.0%          0       1|0     0|1     7m    48k     9   15:23:48 
 87040     *0    369     *0       0     1|0       0   544m  1.36g   391m      0 linkdb:132.6%          0       1|0     0|1     6m    38k     9   15:23:49 

and during the update phase, 170%:

    *0     *0   1083     *0       0     1|0       0  4.03g  8.36g   1.5g      0 linkdb:158.1%          0       0|0     0|1   304k    80k     7   15:25:32 
    *0     *0   1338     *0       0     7|0       0  4.03g  8.36g   1.5g      0 linkdb:171.1%          0       2|0     0|1   376k   100k     7   15:25:33 
    *0     *0   1485     *0       0     1|0       0  4.03g  8.36g   1.5g      0 linkdb:168.8%          0       1|0     0|1   417k   108k     7   15:25:34 
    *0     *0    770     *0       0     1|0       0  4.03g  8.36g   1.5g      0 linkdb:170.2%          0       1|0     0|1   216k    57k     7   15:25:35 
    *0     *0   1840     *0       0     1|0       0  4.03g  8.36g   1.5g      0 linkdb:166.1%          0       0|0     0|1   517k   133k     7   15:25:36 
    *0     *0   1002     *0       0     1|0       0  4.03g  8.36g   1.5g      0 linkdb:172.1%          0       2|0     0|1   281k    74k     7   15:25:37 
    *0     *0   1603     *0       0     7|0       0  4.03g  8.36g   1.5g      0 linkdb:169.0%          0       1|0     0|1   450k   119k     7   15:25:38 
    *0     *0   1167     *0       0     1|0       0  4.03g  8.36g   1.5g      0 linkdb:171.9%          0       1|0     0|1   327k    86k     7   15:25:39 
    *0     *0   1195     *0       0     1|0       0  4.03g  8.36g   1.5g      0 linkdb:168.7%          0       2|1     0|1   335k    88k     7   15:25:40 
    *0     *0   1544     *0       0     1|0       0  4.03g  8.36g   1.5g      0 linkdb:167.0%          0       1|0     0|1   434k   112k     7   15:25:41 

This is, at least mathematically, wrong.

Steps to reproduce:

git clone https://github.com/dcci/linkbench
cd linkbench
mvn clean package -DskipTests
./bin/linkbench -c config/LinkConfigMongoDb.properties -l

This expects a single mongod running on localhost:27017. You can modify config/LinkConfigMongoDb.properties to direct the client elsewhere, if you want/need.



 Comments   
Comment by Davide Italiano [ 04/Jul/14 ]

Yes, but this ticket has a deterministic reproduction case, which SERVER-2230 lacks, apparently.

Comment by Thomas Rueckstiess [ 04/Jul/14 ]

This is a known sampling issue. See SERVER-2230.

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