kfogel@collab.net wrote:
>Branko Čibej <brane@xbc.nu> writes:
>
>
>>kfogel@collab.net wrote:
>>
>>
>>>So don't ask me why, I got it into my head to try this:
>>>
>>> #!/bin/sh
>>> TYPE=you_must_set_this_to_either_fsfs_or_bdb
>>> # TYPE=fsfs
>>> # TYPE=bdb
>>> URL=file://`pwd`/repos/
>>> rm -rf repos wc
>>> svnadmin create --fs-type=${TYPE} repos
>>> svn co ${URL} wc
>>> svn propset svn:externals "wc ${URL}" wc
>>> svn ci -m "Set recursive externals property." wc
>>> rm -rf wc
>>> echo "Begin infinite loop..."
>>> svn co ${URL} wc
>>> # You'll never see this next line.
>>> echo "End infinite loop."
>>>
>>>Here's the interesting thing:
>>>
>>>With TYPE=fsfs, it runs forever. But with TYPE=bdb, it stops at a
>>>certain point -- it seems the database hangs, though I haven't
>>>investigated deeply. Too many simultaneous accessors? I don't know.
>>>As I'm working on something else right now, I thought I'd post this.
>>>
>>>
>>Probably ran out of locks.
>>
>>
>
>Actually, open file descriptors turns out to be the culprit.
>
>
Does that mean that we're not closing them, or that BDB isn't?
>I patched the script to increase lock parameters right after running
>'svnadmin create':
>
> # Fix up DB_CONFIG
> sed -e's/set_lk_max_locks 2000/set_lk_max_locks 20000/' \
> repos/db/DB_CONFIG > repos/db/new.DB_CONFIG
> mv repos/db/new.DB_CONFIG repos/db/DB_CONFIG
>
> sed -e's/set_lk_max_lockers 2000/set_lk_max_lockers 20000/' \
> repos/db/DB_CONFIG > repos/db/new.DB_CONFIG
> mv repos/db/new.DB_CONFIG repos/db/DB_CONFIG
>
> sed -e's/set_lk_max_objects 2000/set_lk_max_objects 20000/' \
> repos/db/DB_CONFIG > repos/db/new.DB_CONFIG
> mv repos/db/new.DB_CONFIG repos/db/DB_CONFIG
>
>But when I ran it again, it got exactly as far as it did before. This
>time I didn't kill it when it hung, I just waited. Eventually, I got
>this:
>
> $ ./repro.sh
> [...]
> Fetching external item into 'wc/wc/wc/wc/wc/wc/wc/wc/wc/wc/wc/wc/wc/\
> wc/wc/wc/wc/wc/wc/wc/wc/wc/wc/wc/wc/wc/wc/wc/wc/wc/wc/wc/wc/wc/wc/wc/\
> wc/wc/wc/wc/wc/wc/wc/wc/wc/wc/wc/wc/wc/wc/wc/wc/wc/wc/wc/wc/wc'
> subversion/libsvn_ra_local/ra_plugin.c:228: (apr_err=180001)
> svn: Unable to open an ra_local session to URL
> subversion/libsvn_ra_local/split_url.c:129: (apr_err=180001)
> svn: Unable to open repository 'file:///home/kfogel/src/subversion/a/repos'
> subversion/libsvn_fs_base/bdb/bdb-err.c:74: (apr_err=160029)
> svn: Berkeley DB error while opening 'copies' table for filesystem \
> /home/kfogel/src/subversion/a/repos/db:
> Too many open files
> ./doit.sh: line 32: 19783 Aborted svn co ${URL} wc
> End infinite loop.
> $
>
>Over file://, that makes sense.
>
>I tried the same recipe using http://, and the recursion went much
>deeper (I eventually killed it, before it brought down my box). We
>could "fix" the file:// implementation, but frankly I don't think it's
>worth the trouble. Multi-user file:// is probably extremely rare;
>multi-user file:// with many externals even rarer.
>
>
You're probably hitting a process limit, not a system limit.
-- Brane
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Received on Tue Jan 18 12:20:39 2005