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From Doğacan Güney (JIRA) <j...@apache.org>
Subject [jira] Issue Comment Edited: (NUTCH-721) Fetcher2 Slow
Date Thu, 02 Apr 2009 13:02:13 GMT

    [ https://issues.apache.org/jira/browse/NUTCH-721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12694986#action_12694986
] 

Doğacan Güney edited comment on NUTCH-721 at 4/2/09 6:01 AM:
-------------------------------------------------------------

I've committed nutch 0.9 fetcher as OldFetcher. So can you test with trunk and OldFetcher
so that we can find out if this is related to new fetcher or is the side effect of some other
change?

      was (Author: dogacan):
    I've committed nutch 0.9 fetcher as OldFetcher. So can you test with trunk and OldFetcher?
  
> Fetcher2 Slow
> -------------
>
>                 Key: NUTCH-721
>                 URL: https://issues.apache.org/jira/browse/NUTCH-721
>             Project: Nutch
>          Issue Type: Bug
>          Components: fetcher
>    Affects Versions: 1.0.0
>         Environment: Fedora Core r6, Kernel 2.6.22-14,  jdk1.6.0_12
>            Reporter: Roger Dunk
>         Attachments: crawl_generate.tar.gz, nutch-site.xml
>
>
> Fetcher2 fetches far more slowly than Fetcher1.
> Config options:
> fetcher.threads.fetch = 80
> fetcher.threads.per.host = 80
> fetcher.server.delay = 0
> generate.max.per.host = 1
> With a queue size of ~40,000, the result is:
> activeThreads=80, spinWaiting=79, fetchQueues.totalSize=0
> with maybe a download of 1 page per second.
> Runing with -noParse makes little difference.
> CPU load average is around 0.2. With Fetcher1 CPU load is around 2.0 - 3.0
> Hosts already cached by local caching NS appear to download quickly upon a re-fetch,
so possible issue relating to NS lookups, however all things being equal Fetcher1 runs fast
without pre-caching hosts.

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