You could have a circular reference in one of your objects. When the garbage collector comes along to deallocate this object, the circular reference means that everything referred to by that reference will never get freed. You can check for circular references with Devel::Cycle and Test::Memory::Cycle. One thing to try (although it might get expensive … Read more
Alert readers of yesterdays breaking news (R 3.0.0 is finally out) may have noticed something interesting that is directly relevant to this question: Profiling via Rprof() now optionally records information at the statement level, not just the function level. And indeed, this new feature answers my question and I will show how. Let’s say, we … Read more
I found an easy solution Step1. connect to DB with an admin user using PLSQL or sqldeveloper or any other query interface Step2. run the script bellow; in the S.SQL_TEXT column, you will see the executed queries SELECT S.LAST_ACTIVE_TIME, S.MODULE, S.SQL_FULLTEXT, S.SQL_PROFILE, S.EXECUTIONS, S.LAST_LOAD_TIME, S.PARSING_USER_ID, S.SERVICE FROM SYS.V_$SQL S, SYS.ALL_USERS U WHERE S.PARSING_USER_ID=U.USER_ID AND UPPER(U.USERNAME) … Read more
No. I have tried pretty much every .NET profiler on the market (ANTS, vTune, OptimizeIt, DevPartner, YourKit), and in my opinion dotTrace is the best of the lot. It is one of only two profilers I have used (the other being YourKit) that has low enough overhead to handle a highly CPU-intensive application. If and … Read more
The VisualVM which comes with jdk6 has a basic profiler inside it. VisualVM is provided with the jdk, so if you have the jdk6 installed, you likely have it installed as well. https://visualvm.github.io/
I used Ants profiler on a large c# project a year and a half ago. It really performed very nicely for what it cost, and even outperformed a few of the more expensive competitors. It calculates cost on with almost a line by line resolution.
Oh, man, where to begin? First, I’m amazed that this is news. Second, the problem is not that profilers are bad, it is that some profilers are bad. The authors built one that, they feel, is good, just by avoiding some of the mistakes they found in the ones they evaluated. Mistakes are common because … Read more
I have used JetBrains dotTrace and Redgate ANTS extensively. They are fairly similar in features and price. They both offer useful performance profiling and quite basic memory profiling. dotTrace integrates with Resharper, which is really convenient, as you can profile the performance of a unit test with one click from the IDE. However, dotTrace often … Read more
gprof (read the paper) exists for historical reasons. If you think it will help you find performance problems, it was never advertised as such. Here’s what the paper says: The proļ¬le can be used to compare and assess the costs of various implementations. It does not say it can be used to identify the various … Read more