Rainer: Thanks for the input. I'll do some additional testing with the sendAllSessions attributes, but my initial testing didn't show much gain. If the rx/tx settings are already chunking up the session bytes into smallish payloads then nothing I change with the sendAllSessions will improve that. I might be completely off base, but I'm unsure of what the rxBufSize and txBufSize attributes do exactly, and if changing them would boost throughput.
Chris: >One question: >Plot those as X-Y in a spreadsheet and you'll see that it's only a bit >worse than linear, especially after 1500. There's no enough data >presented to draw an "exponential performance curve" conclusion: >you're going to need more data to see if this is worse than linear. >Can you collect more data? I know that creating 42k sessions of 700MiB >each is probably a .. challenge, but more data would certainly be helpful. Before I change anything (tuning) I'll do as much testing as I can tonight to generate a data series and graph. Btw, does this list support .ods/.xls attachments? I'm not sure how Tomcat handles building the object containing all the sessions to send (Collection/List?), but it'll be interesting to see if there are points where the basic nature of the Collection object becomes less efficient. The testing so far has already shown that the quantity of sessions (like the 42k test I did in 901 ms on a different app) doesn't appear to be an issue, while large session sizes do. I know that the JVM was forced to make a full copy of all the session data for the application inside heap space too, so after certain points I might be reaching contention with memory management processes that handle heap size, ratios, garbage collection, etc. Having seen how quickly the JVM ramped up memory usage for replication, I'm relatively confident the session aggregation and duplication into a new Collection on the sender side is happening fast... reallllly fast. I'll try to get a protocol analyzer in place to capture the packets and compare them to a basic file transfer of a single large file. If anyone knows much about those rxBufSize and txBufSize settings and whether they'll impact anything let me know. If they operate like TCP congestion and window sizes then adjusting them could have profound performance implications. Thanks! Kyle Harper This communication and any attachments are confidential, protected by Communications Privacy Act 18 USCS ยง 2510, solely for the use of the intended recipient, and may contain legally privileged material. If you are not the intended recipient, please return or destroy it immediately. Thank you. --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
