thanks We will have to have alook at semaphore and other.... stef
On Dec 14, 2010, at 7:08 PM, Tony Fleig wrote: > In case anybody is interested in this... > > I added logging to an external file and found that the hang or crash > always occurs during the delay. > > I removed the Delay from the loop and the problem disappeared. (I'm > sure glad I have a multi-CPU system though, as it ramped one CPU up to > 100%.) > > I conclude that this is not an image processing related problem, but > actually a problem with Delay or semaphores or scheduling in Pharo. > > I'm continuing my efforts to narrow the problem down. > > TF > > On Mon, Dec 13, 2010 at 2:19 PM, Tony Fleig <[email protected]> wrote: >> I tried using the following background changer for Pharo (from >> http://book.pharo-project.org/book/CustomizingPharo/PuttingABackgroundPicture). >> All was well and it nicely changed the background image to various >> images from socwall.com. I walked away and when I came back, Pharo was >> no longer running. >> >> To make a long story short, on Linux and OS X (I did not try Windows), >> after some period of time, regardless of whether I am actively using >> Pharo, Pharo either hangs (becomes unresponsive to input, using 100% >> CPU, images no longer changing) or disappears abruptly. I tried >> several variations of the script, including loading images from a >> local directory (i.e. no network code at all) and even loading images >> into an ImagePreview morph. >> >> In all cases, Pharo eventually either aborts or hangs. I have found >> nothing in the logs to indicate what happened -- no entries at the >> time of the abort or hang at all. Decreasing the delay seems to make >> it happen sooner; I can usually make it happen within 15 minutes of >> execution with a 2 second delay. It seems to happen more quickly when >> changing the background image than in an ImagePreview morph. >> >> I monitored Pharo's memory usage and it increased from 106 MB to 109 >> MB during the execution. Plenty of free memory on the system. >> >> My questions are: >> >> 1. How to debug this? Log to a file to see where it is hanging? >> >> 2. How to regain control of a hung Pharo. I tried Cmd-<everything> to no >> avail. >> >> 3. Does anyone have any idea what might be happening? Some resource >> being used up, a race condition, etc.? >> >> Here's the original script >> >> [[[ >> | rx str url form | >> str := (HTTPSocket httpGet: >> 'http://www.socwall.com/browse/index.php?wpLimit=1&wpSortby=8') >> contents. >> rx := '.*(http\://.+tb_.+\.jpg).*' asRegex. >> url := (rx matches: str) >> ifTrue: >> str := (rx subexpression: 2) >> copyWithRegex: 'tb_' matchesReplacedWith: '' ] >> ifFalse: [ nil ]. >> url ifNotNil: [ >> form := ImageReadWriter formFromStream: (HTTPSocket httpGet: url). >> World backgroundImage: form layout: #scaled]] on: Error do: [:ex| ]. >> 1 minute asDelay wait ] repeat ] newProcess >> name: 'Random background changer'; >> priority: Processor userBackgroundPriority; >> resume >> >> >> Regards, >> TF >> >
