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| <== Date ==> | <== Thread ==> |
|---|
| Subject: | Re: Let's use the STL! [Was: about the abstractData.h] |
| From: | [email protected] (Bob Dalesio) |
| To: | Benjamin Franksen <[email protected]>, EPICS Techtalk <[email protected]> |
| Date: | Wed, 04 Oct 2000 19:24:46 -0600 |
The problem with the STL is that the performance of these libraries is truly horrible. The approach that is currently planned is to attempt to provide very similar functionality - just with some good performance. It is expected that the STL will replace these libraries when it grows up. There are a number of places where these standard, industry-wide standards just do not live up to the kind of performance that is expected. With each new technology, we take a significant performance hit. When we first started using vxWorks we found that their locking semaphores used 75 usecs even when the semaphore was available. Our rewritten one took 3 usecs when the semaphore was available. It took one small design meeting about 4 hours to design the code and prove that it was safe. It was worth it. Bob