需要帮助分析VarnishStat结果

时间:2011-08-27 12:49:01

标签: caching apache2 varnish

我是Varnish的新手。我已成功安装它,现在它正在工作,但我需要一些知识渊博的人提供有关服务器性能的指导。

我读过这篇文章 - http://kristianlyng.wordpress.com/2009/12/08/varnishstat-for-dummies/,但我仍然不确定服务器性能如何。

自上次使用9小时后服务器一直在运行。我知道更多内容会随着时间的推移而缓存,因此缓存命中率会更好,但是现在我关心的是关于服务器性能的中间帮助。

Hitrate ratio:       10      100      613
Hitrate avg:     0.2703   0.3429   0.4513

      239479         8.00         7.99 client_conn - Client connections accepted
      541129        13.00        18.06 client_req - Client requests received
      157594         1.00         5.26 cache_hit - Cache hits
           3         0.00         0.00 cache_hitpass - Cache hits for pass
      313499         9.00        10.46 cache_miss - Cache misses
       67377         4.00         2.25 backend_conn - Backend conn. success
      316739         7.00        10.57 backend_reuse - Backend conn. reuses
         910         0.00         0.03 backend_toolate - Backend conn. was closed
      317652         8.00        10.60 backend_recycle - Backend conn. recycles
         584         0.00         0.02 backend_retry - Backend conn. retry
           3         0.00         0.00 fetch_head - Fetch head
      314040         9.00        10.48 fetch_length - Fetch with Length
        4139         0.00         0.14 fetch_chunked - Fetch chunked
           5         0.00         0.00 fetch_close - Fetch wanted close
         386          .            .   n_sess_mem - N struct sess_mem
          55          .            .   n_sess - N struct sess
      313452          .            .   n_object - N struct object
      313479          .            .   n_objectcore - N struct objectcore
       38474          .            .   n_objecthead - N struct objecthead
         368          .            .   n_waitinglist - N struct waitinglist
          12          .            .   n_vbc - N struct vbc
          61          .            .   n_wrk - N worker threads
         344         0.00         0.01 n_wrk_create - N worker threads created
        2935         0.00         0.10 n_wrk_queued - N queued work requests
           1          .            .   n_backend - N backends
          47          .            .   n_expired - N expired objects
      149425          .            .   n_lru_moved - N LRU moved objects
           1         0.00         0.00 losthdr - HTTP header overflows
      461727        10.00        15.41 n_objwrite - Objects sent with write
      239468         8.00         7.99 s_sess - Total Sessions
      541129        13.00        18.06 s_req - Total Requests
       64678         3.00         2.16 s_pipe - Total pipe
        5346         0.00         0.18 s_pass - Total pass
      318187         9.00        10.62 s_fetch - Total fetch
   193589421      3895.84      6459.66 s_hdrbytes - Total header bytes
  4931971067     14137.41    164569.09 s_bodybytes - Total body bytes
      117585         3.00         3.92 sess_closed - Session Closed
        2283         0.00         0.08 sess_pipeline - Session Pipeline
         892         0.00         0.03 sess_readahead - Session Read Ahead
      458468        10.00        15.30 sess_linger - Session Linger
      414010         9.00        13.81 sess_herd - Session herd
    36912073       880.96      1231.68 shm_records - SHM records

1 个答案:

答案 0 :(得分:2)

您使用的是什么VCL?如果答案是“无”,那么你可能没有获得非常好的命中率。在全新安装中,Varnish对它的缓存(以及正确的)非常保守,但你可以通过阅读how to achieve a high hitrate来改善问题。如果它是安全的,您可以选择性地取消设置cookie并使用您的VCL规范化请求,这将减少后端呼叫。

您的网站有多少可缓存?你的对象缓存是否足够大?如果你能回答这两个问题,你应该能够用Varnish达到很高的效果。