[
https://issues.apache.org/jira/browse/NUTCH-721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12695277#action_12695277
]
Doğacan Güney commented on NUTCH-721:
-------------------------------------
Wow, 53 min vs 3 min !?
Thanks a lot for testing and that is indeed very worrying.
Which 5000 url set did you use? I think the crawl_generate you attached to this
issue has 13K urls?
PS: One small thing new Fetcher requires less threads than OldFetcher. If you
have time can you try with
smaller number of threads (say, 15-20)?
> 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.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
