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.NET Forum / .NET Framework / Performance / February 2004Abysmal performance of throw/catch in VB.NET
Running on a fast machine, if I issue a throw of a user defined exception, it's 6 seconds before the catch in the calling code is called. I wrote an app with nothing but a throw/catch to make sure it wasn't some other problem. This can't be normal. Is there something I'm missing Dan > Running on a fast machine, if I issue a throw of a user defined exception, it's 6 seconds before the catch in the calling code is called. I wrote an app with nothing but a throw/catch to make sure it wasn't some other problem. This can't be normal. Is there something I'm missing? Try to change the code so that it will not throw the exception the first time it passes. Then re-invoke and measure. What probably happens is that you are measuring a lot of start-ups, JIT compilation and initialisation time along with your test case. Martin. Hi, Are you running under VS.NET?  SignatureMiha Markic [MVP C#] - RightHand .NET consulting & development miha at rthand com www.rthand.com > Running on a fast machine, if I issue a throw of a user defined exception, it's 6 seconds before the catch in the calling code is called. I wrote an app with nothing but a throw/catch to make sure it wasn't some other problem. This can't be normal. Is there something I'm missing? > Dan > Running on a fast machine, if I issue a throw of a user defined > exception, it's 6 seconds before the catch in the calling code is > called. I wrote an app with nothing but a throw/catch to make sure it > wasn't some other problem. This can't be normal. Is there something > I'm missing? My guess is that you're throwing an instance of ApplicationException (or a derived class). For some reason, the first time that happens it *does* seem to take a long time (sometimes - I now can't reproduce it easily). I suspect it's loading some resources (e.g. error message translation) into memory. SignatureJon Skeet - <skeet@pobox.com> http://www.pobox.com/~skeet If replying to the group, please do not mail me too Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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