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problem with random seed in vmanager

buddi

Hi

i have written vmanager regression scrip

For every regression run i observed that it is taking same seed (default seed of specmen tool 1 is taking).

 my reg scrip is

group small_test {
  sve_name: "" ;
  run_script: "" ;
  scan_script: "vm_scan.pl shell.flt ius.flt" ;
   test test1 {
  count : 2;
    run_script: "irun -ovm -COVDUT <<all related files included>> -timescale 1ns/10ps -access +rwc -messages +OVM_TESTNAME=test1";
  };

can you please help me on this

  • Add “seed: random” to your group/test.

    Tim

  • You do need to pass the seed to irun.

         run_script: "irun -ovm -COVDUT <<all related files included>> -timescale 1ns/10ps -access +rwc -messages +OVM_TESTNAME=test1 -svseed $RUN_ENV(BRUN_SV_SEED)";

  • 1) can i pass seed value like below. "run_script: "irun -ovm -COVDUT <> -timescale 1ns/10ps -access +rwc -messages +OVM_TESTNAME=test1 -svseed $RUN_ENV(BRUN_SV_SEED) -seed $RUN_ENV(BRUN_SEED)" 2) how i can pass random seed for every test in the regression group and for every count.. Is there any syntax for defining in group. ( i am using specmen tool) 3) Actually i saw in xmanager manual that 'if we have not defined any seed value in the group, by default it will create random seed for every run. " what is the difference between BUN_SV_SEED and "sv_seed: random "(defining in group)

  • Try moving the run_script to the group instead of the test. Please check the TEST_NAME syntax as I am telling you that from memory! Also please do look in the docs, as the VSIF syntax is fully explained for stuff like this. Run "vm_help.sh" from the UNIX prompt.

     

    group small_test {
      sve_name: "" ;
      run_script: "" ;
      scan_script: "vm_scan.pl shell.flt ius.flt" ;

        run_script: "irun -ovm -COVDUT <<all related files included>> -timescale 1ns/10ps -access +rwc -messages +OVM_TESTNAME=$ATTR(TEST_NAME) -seed $RUN_ENV(BRUN_SEED)";


       test test1 {
      count : 2;

      };

  • Thanks Stephen. $RUN_ENV instruction working.

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