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Subject: Frequent garbage collections with SPMN62
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iraklis
Posts: 13
Online: User is Offline
11/27/2007 3:00 AM  
Hi everybody,

I have noticed that SPMN62 appears to do garbage collection a lot more frequently than SPMN60. I tried the following testcase to support my claim using both SPMN60 (6.0) and SPMN62 (06.20.001-p):

* Specman default limits for max memory size, garbage collection etc.
* Same VE, configuration, ecom, simulator, launch scripts etc.
* Same test consisting a single and simple (not memory intensive) transaction
* A few 'e' testbench variables traced by the ecom file

Using SPMN60, I got no garbage collections.
Using SPMN62, I got 6(!) garbage collections. Interestingly enough, when I removed the traced variables from the ecom file, I got no garbage collections using SPMN62.

Has anyone else noticed the same behavior? Any ideas on why SPMN62 does so many garbage collections?
Iraklis.
ddmello
Posts: 15
Online: User is Offline
11/27/2007 11:19 AM  
Hi Iraklis,

Thank you for sharing this info. There were some changes to the waveform integration in Specman 6.2 and Cadence R&D would like to investigate this issue.

Please would you open a support request with Cadence support (http://sourcelink.cadence.com) and share as much of the testcase as possible?

We can send an update to this forum once the issue is understood and a workaround/fix is available.

Thanks,
Dean
(ddmello@cadence.com)
iraklis
Posts: 13
Online: User is Offline
11/28/2007 2:36 AM  
Hi Dean,

Thank you for your reply. I opened a support request at sourcelink.
Iraklis.
hannes
Posts: 30
Online: User is Offline
12/03/2007 8:57 AM  
Hello Iraklis,

R&D have fixed the issue and have send a patch to support (which you should receive shortly).
In addition, the next hotfix (the one after the current 06.20.002-s) will include the fix, so no need
to load the patch.

Regards,
-hannes
iraklis
Posts: 13
Online: User is Offline
12/05/2007 12:03 AM  
Hi Hannes,

Thank you for the update and kudos to the R&D team for promptly producing the patch! I have just checked it against my testcase and it seems to work fine, I am no longer getting the frequent garbage collections using SPMN62. For what it's worth, the suspect behavior appeared to be triggered when waving 'e' variables of enumerated type, so if anyone is observing this behavior, be sure to use the patch.
Iraklis.
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Forums > Functional Verification > e > Frequent garbage collections with SPMN62


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