We have been experiencing the oft-noted but elusive problem where the CF server hangs while executing threads and begins queuing them up. After about a minute it can execute all of the threads.
During a month of excruciating examination of the perf mon and every facet imaginable of our code and the cf admin, we stored debug information in a REQUEST variable during the execution of many pages including application.cfm. We finally traced the hangs to three different points in our code ? all of which are a CreateUUID() call. To verify, we placed a CreateUUID() call at the top of application.cfm and sure enough, it became the codeline that caused the cf servers to hang. What is going on in the CreateUUID() call? I assumed that it was creating a combination of the current time in milliseconds, the MAC address on an ethernet card, and a random number. Could the CreateUUID() call be hanging on one of these components? Our config is: CFMX 6.1 Win 2k Server SP4 2GB Ram One interesting note is that when equal load is distributed on our two servers, on our server with dual 2.4GHz Xeons, the problem is experienced about 16 times per day, whereas it is only 4 times per day on dual 1.67 GHz Athlons. Each is using an onboard NIC, and I assume that they are different chipsets, although I have not verified. Perhaps the float math is handled differently and this is affecting random number generation in CreateUUID()? I can rewrite our code to not use CreateUUID and instead use the database to generate UUIDs when we need true uniqueness, and otherwise use random numbers. I am concerned, though, that our servers will hang again if there is some problem upstream. Any thoughts? -Tim ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| Message: http://www.houseoffusion.com/lists.cfm?link=i:4:138287 Archives: http://www.houseoffusion.com/lists.cfm?link=t:4 Subscription: http://www.houseoffusion.com/lists.cfm?link=s:4 Unsubscribe: http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=89.70.4 Your ad could be here. Monies from ads go to support these lists and provide more resources for the community. http://www.fusionauthority.com/ads.cfm
