I just committed the journal compacting into trunk. I have tested it on the performance labs, and compacting happens totally in parallel. I have added a test that was adding one message per second in a destination (without consuming it): | num-messages=1000 | num-warmup-messages=0 | message-size=1024 | durable=true | transacted=true | batch-size=100 | drain-queue=true | throttle-rate=10 | address=perfAddress2 | queue-name=perfQueue2 | host=172.16.8.10 | port=5445 | tcp-buffer=1048576 | tcp-no-delay=false | send-window=1048576 | pre-ack=true | block-ack=false | block-persistent=false | Then I started runSender and runListener as usual. Running both transactional (as the next code example) and non transactional. | num-messages=500000 | num-warmup-messages=20000 | message-size=1024 | durable=true | transacted=true | batch-size=1000 | drain-queue=true | queue-name=perfQueue | throttle-rate=-1 | address=perfAddress | queue-name=perfQueue | host=172.16.8.10 | port=5445 | tcp-buffer=1048576 | tcp-no-delay=false | send-window=1048576 | pre-ack=true | block-ack=false | block-persistent=false | and I could get 28K messages / second if either having the first sender or or not. On my desktop, with a more limited disk.. I had 20K messages / second without the first sender.. and 15 messages / second with the first sender. I also compared the performance on the regular scenario on with and without those changes, and I could get the same performance as expected. Now... as I said on the other thread, we need to implement clean up next. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4241615#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...