FAQS

What does the vovslavemgr command do? (NetworkComputer)

The NC slaves.tcl file stores the persistent configuration information used by the vovslavemgr command. The vovslavemgr list sub-command shows the names of the vovslaves configured therein, and also provides a...

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What are the FlowTracer Barriers?

A design flow is usually triggered by timestamps on files. Whenever a timestamp changes, FlowTracer assumes that the data in the file has changed and hence all jobs consuming the file will become invalid and ne...

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How to use Barriers in FlowTracer

Instead of this flow with 2 jobs and 'A' output of the first, input to the second: T vw something O A T vw JobA I A By including a barrier define: T vw something O -md5 A ...

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What is RECONCILE_WITH_FILE_SYSTEM in FlowTracer?

FlowTracer keeps track of job success based in job exit status, timestamps and status of inputs and outputs. Sometimes users are not interested in running the whole flow within FlowTracer or they already have ...

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VOV: Do I need to restart after changing security.tcl?

After changing the security settings by updating the security.tcl file, you do not need to stop and start the vovserver to pick up the new settings. New settings are picked up by vovproject reread, vovproject s...

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VOV: What is the unit of cputime for Runtime Tools?

Our tools measure the cputime in millisecs. Please note that for running jobs the cputime is updated in certain intervals only. An accurate value for the entire job is computed after a job has completed.

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Using Preemption with the External Process Method (Network Computer)

When using the EXT (external) method for preemption in NetworkComputer, only selected programs in the process tree are signaled. This is necessary, because some programs do not respond well when the entire pro...

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Using Hyperthreading with NetworkComputer

There is a downside to using hyper-threading with NC with default settings. NC will view a hyper-threaded core as two slots, consuming twice the licenses, but only yielding slightly better performance than a s...

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Failed subcommand run in 2016.09u9 (NetworkComputer)

In the Runtime 2016.09u9 release, job submitters may receive a message like: equiv 08/22/2017 12:09:29: USER ERROR: Failed subcommand run: can't read "some-variable-name: no such variable This happens if your...

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What is the Alert "vovlsfd: not enough file descriptors" on FlowTracer?

When running many parallel jobs with vovlsfd, several default settings may limit your system's performance. One symptom of such a limitation may be the alert "vovlsfd: not enough file descriptors". This articl...

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