[Twisted-Python] deferToThread crashing on Windows, stable on Linux
I have run into an interesting little bug and before I try to hunt it down further I wanted to check and see if anyone else has seen anything similar. I have a fairly complex twisted 2.5 application that uses deferToThread to spawn off worker threads that need to call some blocking non-twisted code (query webserver, query database, etc). The application uses these workers quite a bit but there are normally never more then 2 or 3 outstanding requests running. The application runs rock-solid on Linux, but it crashes in less then a minute on Windows. Has anyone else seen anything like this? Are there any known issues of deferToThread being less stable on Windows then Linux or are their any differences between how twisted works on the platforms that I should be looking into? -Allen
On 8/30/07, Allen Bierbaum <abierbaum@gmail.com> wrote:
I have run into an interesting little bug and before I try to hunt it down further I wanted to check and see if anyone else has seen anything similar.
I have a fairly complex twisted 2.5 application that uses deferToThread to spawn off worker threads that need to call some blocking non-twisted code (query webserver, query database, etc). The application uses these workers quite a bit but there are normally never more then 2 or 3 outstanding requests running.
The application runs rock-solid on Linux, but it crashes in less then a minute on Windows.
Has anyone else seen anything like this? Are there any known issues of deferToThread being less stable on Windows then Linux or are their any differences between how twisted works on the platforms that I should be looking into?
-Allen
I use deferToThread heavily for the same thing on Windows and haven't seen any crashes. I would double and triple check the threadsafety of the APIs you are calling.
Ok. I will start searching the code. This may be more of a python question, but my crash ends up being: Unhandled exception at 0x1e0ab834 in python.exe: 0xC0000005: Access violation reading location 0x00005526. I can go into visual studio and see the C/C++ call stack, but this doesn't let me see the python callstack. Is there a good way to get a the python callstack (for multiple threads) when bug triggers on the C/C++ side of the fence? -Allen On 8/30/07, Chris Mellon <arkanes@gmail.com> wrote:
On 8/30/07, Allen Bierbaum <abierbaum@gmail.com> wrote:
I have run into an interesting little bug and before I try to hunt it down further I wanted to check and see if anyone else has seen anything similar.
I have a fairly complex twisted 2.5 application that uses deferToThread to spawn off worker threads that need to call some blocking non-twisted code (query webserver, query database, etc). The application uses these workers quite a bit but there are normally never more then 2 or 3 outstanding requests running.
The application runs rock-solid on Linux, but it crashes in less then a minute on Windows.
Has anyone else seen anything like this? Are there any known issues of deferToThread being less stable on Windows then Linux or are their any differences between how twisted works on the platforms that I should be looking into?
-Allen
I use deferToThread heavily for the same thing on Windows and haven't seen any crashes. I would double and triple check the threadsafety of the APIs you are calling.
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Allen Bierbaum -
Chris Mellon