linux – mongodb和非常高的锁定百分比和低吞吐量

> 95％的锁定百分比
>服务器是一个拥有2个内核,6 GB内存的虚拟机,在mongodb的快速NAS上具有NFS v3共享(noatime).
> centos 5.7 x86_64,mongo 2.0.2,php-pecl-mongo 1.2.6(不是最新版本,但很快就会更新:)
> mongo(当前/错误地)配置为没有slave的单个主服务器
> db今天已经从头开始创建. 20个Web服务器正在写入它(使用更新)
>不确定向服务器发送了多少次更新,但处理的数量非常少
>我不确定这是否是索引问题：如何诊断？
>当前磁盘数据(包括oplog,journal …)小于600 MB
> dstat：

----total-cpu-usage---- -dsk/total- -net/total- ---paging-- ---system--
usr sys idl wai hiq siq| read  writ| recv  send|  in   out | int   csw
 46   1  53   0   0   0|   0  4096B|  42k   19k|   0     0 | 317  5328
 48   1  52   0   0   1|   0    92k|  46k 7590B|   0     0 | 321  5308
 50   2  48   0   0   0|   0     0 |  39k 7218B|   0     0 | 304  5359
 47   1  51   0   0   1|   0     0 |  47k   10k|   0     0 | 332  5679
 46   1  52   0   0   0|   0     0 |  44k   15k|   0     0 | 319  5099

> nfsiostat为空(0 ops / s)(当然iostat是相同的)
> mongostat：

insert  query update delete getmore command flushes mapped  vsize    res faults locked % idx miss %     qr|qw   ar|aw  netIn netOut  conn repl       time
     0      0      0      0       0       1       0  1.41g  8.39g   242m      0     96.2          0    0|3280  1|5322    62b     1k  5324    M   21:11:50
     0      0      0      0       0       1       0  1.41g  8.39g   242m      0     96.5          0    0|3204  1|5322    62b     1k  5324    M   21:11:51
     0      0      0      0       0       1       0  1.41g  8.39g   242m      0       96          0    1|3351  1|5322    62b     1k  5324    M   21:11:52
     0      0      1      0       0       1       0  1.41g  8.39g   242m      0     96.9          0    0|3251  1|5322   485b     1k  5324    M   21:11:53
     0      0      0      0       1       1       0  1.41g  8.39g   242m      0     95.6          0    0|3280  1|5322   112b     1k  5324    M   21:11:54

> db.serverStatus()

{
        "host" : "foo001","version" : "2.0.2","process" : "mongod","uptime" : 21370,"uptimeEstimate" : 18626,"localTime" : ISODate("2012-02-23T20:20:59.589Z"),"globalLock" : {
                "totalTime" : 21369761258,"lockTime" : 19450568051,"ratio" : 0.9101911722911022,"currentQueue" : {
                        "total" : 3570,"readers" : 0,"writers" : 3570
                },"activeClients" : {
                        "total" : 5500,"readers" : 1,"writers" : 5499
                }
        },"mem" : {
                "bits" : 64,"resident" : 255,"virtual" : 8782,"supported" : true,"mapped" : 1440,"mappedWithJournal" : 2880
        },"connections" : {
                "current" : 5501,"available" : 4099
        },"extra_info" : {
                "note" : "fields vary by platform","heap_usage_bytes" : 81930736,"page_faults" : 2916
        },"indexCounters" : {
                "btree" : {
                        "accesses" : 2377,"hits" : 2377,"misses" : 0,"resets" : 0,"missRatio" : 0
                }
        },"backgroundFlushing" : {
                "flushes" : 356,"total_ms" : 2372,"average_ms" : 6.662921348314606,"last_ms" : 0,"last_finished" : ISODate("2012-02-23T20:20:56.446Z")
        },"cursors" : {
                "totalOpen" : 5500,"clientCursors_size" : 5500,"timedOut" : 0,"totalNoTimeout" : 5499
        },"network" : {
                "bytesIn" : 51373772,"bytesOut" : 51176411,"numRequests" : 176017
        },"repl" : {
                "ismaster" : true
        },"opcounters" : {
                "insert" : 0,"query" : 25,"update" : 142157,"delete" : 0,"getmore" : 39053,"command" : 284
        },"asserts" : {
                "regular" : 0,"warning" : 0,"msg" : 0,"user" : 0,"rollovers" : 0
        },"writeBacksQueued" : false,"dur" : {
                "commits" : 19,"journaledMB" : 0,"writeToDataFilesMB" : 0,"compression" : 0,"commitsInWriteLock" : 0,"earlyCommits" : 0,"timeMs" : {
                        "dt" : 3083,"prepLogBuffer" : 0,"writeToJournal" : 0,"writeToDataFiles" : 0,"remapPrivateView" : 0
                }
        },"ok" : 1
}

>我们的数据库：

{
        "db" : "mydb","collections" : 6,"objects" : 119174,"avgObjSize" : 323.99872455401345,"dataSize" : 38612224,"storageSize" : 57286656,"numExtents" : 26,"indexes" : 4,"indexSize" : 3899952,"fileSize" : 469762048,"nsSizeMB" : 16,"ok" : 1
}

任何提示？

问候,

D.

PS：我也把它交叉发布给了mongo-user