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| bolapara_ | hi all. im using zodb with greenlets (gevent). getting "Duplicate tpc_begin calls for same transaction". not sure what im doing wrong. here is a simple example of the greenlet code: http://pastebin.com/x4uEQQtC | 02:06 |
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| bolapara_ | using latest zodb, gevents in pypi | 02:07 |
| bolapara_ | any suggestions would be appreciated | 02:10 |
| davisagli | bolapara_: ZODB is probably not a good choice for use with greenlets if you're going to have a large number of connections, since each ZODB connection has its own in-RAM cache of objects from the database which tends to eat quite a bit of RAM | 02:11 |
| davisagli | it sounds like gevent must not be successfully monkey-patching something related to the thread-locals used by the transaction package | 02:12 |
| bolapara_ | davisagli: hm. well, for my purposes large memory use should be OK. the number of concurrent greenlets should only be in the hundreds. | 02:12 |
| bolapara_ | ahh | 02:13 |
| davisagli | you can at least configure the cache size, and figure out what the performance implications are to not having data in cache :) | 02:13 |
| bolapara_ | ok, thanks. well if I dont get past this issue then it doesn't matter anyway :) | 02:15 |
| davisagli | bolapara_: I'm not sure anyone's tried to make the ZODB work with greenlets yet, so you're probably mostly on your own | 02:18 |
| davisagli | but might be worth asking on the zodb-dev mailing list to reach a slightly wider audience | 02:19 |
| bolapara_ | davisagli: OK. will reevaluate if zodb is the right choice then go from there. thanks for the help | 02:20 |
| bolapara_ | davisagli: FYI, I was using all gevent native code until I added ZODB and when I did I forgot to do monkey.patch_all(). adding that made it work. | 02:47 |
| davisagli | bolapara_: nice | 02:48 |
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