Hi Eric, for such high load you will need to adjust a few things:
1) set a higher ulimit. By default its 1024 on linux which is prolly not enough ( I use fbsd which use 11095 by default) 2) set a higher connection backlock in smtpserver.log Bye, Norman 2010/5/2 Eric Charles <eric.char...@u-mangate.com>: > Hi Norman, > > Trying to simulate a more real-life test case, I developed a small bomber > class that launches parallel threads. Each thread sends mails with > attachements (with small pause between each mail sending). > > I tested with embedded derby with JDBCDomainList. > > Depending on the parameters (10 to 100 parallel threads, 5 ms to 100 ms > pause, 1KB to 100KB attachement), I could have on my dev laptop 5 to 10 > mails per second being processed. > > The good think is that I have no exception at all during stable phase. > > However, I was not able to have more mails being processed on my latptop due > to disk access. The CPU and memory are really not charged (20 - 30 %), but > disk is really working non-stop. > This is probably the price to pay for activemq and the kahadb. > > Complete scenario with unstable phase: > - Bomb 5 minutes > - Stop bomb. > - Still some mails are spooled for a while which is quite normal. > - When all mails are spooled, disk still runs crazy for minutes, console > showing a few messages "Slow KahaDB access: cleanup took 684" > - rebombing : org.apache.camel.CamelExecutionException: Exception occurred > during execution on the exchange: Exchange[Message: > org.apache.james.core.maili...@16863f2] Caused by: java.io.IOException: Too > many open files - error message in the bomber > - Server console show still a few mails being spooled. > - After, server does not respond on socket - no more exception. > > Disk congestion may come from my disk. > I will setup a server environment with good disk, and will rerun the test in > a few days. > A database on a separate server could also help. > > Btw, what should we consider as acceptable/needed as load (xxx mails from > yyy parallel clients) ? > > Tks, > > Eric > > > > On 05/01/2010 09:25 AM, Norman Maurer wrote: >> >> About 6000, then I run out of heap space.. >> >> Can you maybe try to deploy it with james and bomb it via smtp ? I was >> not able to see any exception. >> >> Thx, >> Norman >> >> >> 2010/5/1 Eric Charles<eric.char...@u-mangate.com>: >> >>> >>> Hi Norman, >>> >>> Similar exceptions with properties.put("openjpa.LockTimeout", "30000"); >>> >>> I think the environment simply can not follow the load (more than one >>> mail >>> sent each ms). >>> Bootleneck can be anywhere (connection creation, database lock, >>> openjpa,...). >>> This is why I put a sleep between each mail sending. >>> Real servers will better hold the pressure. >>> >>> So I think I'm limited by my environment : it does not allow me to have a >>> really heavy load to validate that IMAP-137 is resolved. >>> Well, it is probably, as before you commits, I directly had the duplicate >>> key exception. >>> >>> How much mails can you hold on your env with h2 inmemory ? >>> >>> Tks, >>> >>> Eric >>> >>> >>> On 05/01/2010 09:08 AM, Norman Maurer wrote: >>> >>>> >>>> Hi Eric, >>>> >>>> thx for your tests. The order of the uid is caused by the threads, >>>> thats nothing to worry about. >>>> >>>> About the timeout, can you try to add this to the test case: >>>> >>>> properties.put("openjpa.LockTimeout", "30000"); >>>> >>>> And keep in mind that we don't use any connection pooling in the test >>>> case so the performance should be better when use it in deployment. >>>> >>>> Bye, >>>> Norman >>>> >>>> >>>> 2010/5/1 Eric Charles<eric.char...@u-mangate.com>: >>>> >>>> >>>>> >>>>> Hi, >>>>> >>>>> I just tested the JPAStressTest (for IMAP-137 JPA fails to persist >>>>> MailboxMembership Entity on heavy load) Norman committed yesterday. >>>>> >>>>> I made some tests towards derby (memory and embedded) , h2 (memory and >>>>> embedded) and mysql with following configs (and adding the needed jdbc >>>>> drivers in pom.xml): >>>>> >>>>> // Derby Memory >>>>> properties.put("openjpa.ConnectionDriverName", >>>>> org.apache.derby.jdbc.EmbeddedDriver.class.getName()); >>>>> properties.put("openjpa.ConnectionURL", >>>>> "jdbc:derby:memory:derbyimap;create="); >>>>> >>>>> // Derby Embedded >>>>> // properties.put("openjpa.ConnectionDriverName", >>>>> org.apache.derby.jdbc.EmbeddedDriver.class.getName()); >>>>> // properties.put("openjpa.ConnectionURL", >>>>> "jdbc:derby:derbyimap;create=;user=root;password=root"); >>>>> >>>>> // H2 Memory >>>>> // properties.put("openjpa.ConnectionDriverName", >>>>> org.h2.Driver.class.getName()); >>>>> // properties.put("openjpa.ConnectionURL", >>>>> "jdbc:h2:mem:h2imap;DB_CLOSE_DELAY=; >>>>> >>>>> // H2 Embedded >>>>> // properties.put("openjpa.ConnectionDriverName", >>>>> org.h2.Driver.class.getName()); >>>>> // properties.put("openjpa.ConnectionURL", >>>>> "jdbc:h2:~/h2/h2imap;USER=;PASSWORD=root"); >>>>> >>>>> //Mysql >>>>> // properties.put("openjpa.ConnectionDriverName", >>>>> com.mysql.jdbc.Driver.class.getName()); >>>>> // properties.put("openjpa.ConnectionURL", >>>>> >>>>> >>>>> "jdbc:mysql://localhost:3306/msqlimap?user=&password=root&createDatabaseIfNotExist=true&useUnicode=true&characterEncoding=utf-8"); >>>>> >>>>> >>>>> I first changed the maximum number of messages from 1.000 to 100.000 >>>>> and >>>>> saw >>>>> on my linux dev PC (james server, stresstest and databases all running >>>>> on >>>>> same dev PC): >>>>> >>>>> Derby: after many mails sending: >>>>> java.io.IOException: Too many open files >>>>> ... >>>>> Exception in thread "pool-1-thread-1044" >>>>> java.lang.NoClassDefFoundError: >>>>> org/apache/james/imap/api/display/HumanReadableText >>>>> ... >>>>> >>>>> H2: after 400 mails: >>>>> java.io.IOException: Too many open files >>>>> ... >>>>> Caused by:<openjpa-1.2.2-r422266:898935 nonfatal general error> >>>>> org.apache.openjpa.persistence.PersistenceException: Timeout trying to >>>>> lock >>>>> table MEMBERSHIP [50200-79] {prepstmnt 406576 >>>>> INSERT INTO Membership (mailboxId, uid, answered, deleted, draft, >>>>> flagged, internalDate, recent, seen, size, MESSAGE_ID) >>>>> VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?) >>>>> [params=g) 1, (long) 49, (int) 0, (int) 0, (int) 0, (int) 0, >>>>> (Timestamp) >>>>> 2010-05-01 08:37:10.293, (int) 0, (int) 0, (int) 25, (long) 4151]} >>>>> [codeP200, state=T00] >>>>> ... >>>>> >>>>> MySql : after +/- 1000 (always around 1002 and 1007) mails : >>>>> Exception in thread "pool-1-thread-84"<openjpa-1.2.2-r422266:898935 >>>>> nonfatal user error> >>>>> org.apache.openjpa.persistence.NoResultException: >>>>> The >>>>> query on candidate type "class >>>>> org.apache.james.imap.jpa.mail.model.JPAMailbox" with filter "SELECT >>>>> mailbox >>>>> FROM Mailbox mailbox WHERE mailbox.mailboxId =Param" was configured to >>>>> have a unique result, but no instance matched the query. >>>>> .... >>>>> org.apache.james.imap.mailbox.MailboxNotFoundException: Mailbox >>>>> '#mail.INBOX' not found. >>>>> ... >>>>> >>>>> 3 different databases, 3 different behaviour/exceptions. >>>>> >>>>> Running 3 components (james server, stresstest, database) on my >>>>> "not-so-strong-PC" may be an issue. >>>>> >>>>> To make the tests successful, I added a Thread.sleep(5) (15 ms for >>>>> embedded >>>>> derby and h2) between each mail sending. >>>>> >>>>> >>>>> I suppose we can say that in a real environment, the load will never be >>>>> that >>>>> heavy, and that real server will perform better. >>>>> >>>>> >>>>> I also saw that the uid order is not respected: >>>>> >>>>> Append message with uidb58 >>>>> Append message with uidb59 >>>>> Append message with uidb56 >>>>> Append message with uidb57 >>>>> >>>>> This could come from a print mismatch, and not from uid being generated >>>>> in a >>>>> bad order. >>>>> >>>>> Tks in advance for your feedbacks, if any, >>>>> >>>>> >>>>> Eric >>>>> >>>>> >>>>> --------------------------------------------------------------------- >>>>> To unsubscribe, e-mail: server-dev-unsubscr...@james.apache.org >>>>> For additional commands, e-mail: server-dev-h...@james.apache.org >>>>> >>>>> >>>>> >>>>> >>>> >>>> --------------------------------------------------------------------- >>>> To unsubscribe, e-mail: server-dev-unsubscr...@james.apache.org >>>> For additional commands, e-mail: server-dev-h...@james.apache.org >>>> >>>> >>>> >>> >>> --------------------------------------------------------------------- >>> To unsubscribe, e-mail: server-dev-unsubscr...@james.apache.org >>> For additional commands, e-mail: server-dev-h...@james.apache.org >>> >>> >>> >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: server-dev-unsubscr...@james.apache.org >> For additional commands, e-mail: server-dev-h...@james.apache.org >> >> > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: server-dev-unsubscr...@james.apache.org > For additional commands, e-mail: server-dev-h...@james.apache.org > > --------------------------------------------------------------------- To unsubscribe, e-mail: server-dev-unsubscr...@james.apache.org For additional commands, e-mail: server-dev-h...@james.apache.org