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openResults() bug in 6.1.5?

markbeck

I'm encountering a bug in version  6.1.5.500.1

I am seeing a bug when I do the following:

  1. Run a paramRun transient simulation
  2. Issue an openResults() command to open the result set
  3. selectResults('tran)

This results in a error "results 'tran not found".

However, if I exit virtuoso and restart, I can issue the openResults and selectResults('tran) command and virtuoso is able to see the new results.

Is anyone else seeing this bug?

Mark

 

 

  • markbeck

     So, after some poking around, it appears more like this is some sort of interaction between NTFS and Virtuoso.  It's as though Virtuoso is looking at the network results and depending on when it last looked, it will respond with the data or just what's in memory.

     So I'm going to re-phrase the question into:

    Is there a way to force virtuoso to re-load from the network drive when I issue an openResults() command (as opposed to merely presenting what it thinks is the results are based on what it has in memory)?

     Mark

  • dmay

    We experienced a similar situation where a file was changed on a different machine. The file was stored on an NFS mounted Network Appliance. From my machine, I could not see the changes in the file for up to one minute. We tracked this down to the settings for NFS caching which defaults to 60 seconds. If you reduce this value, you will get a performance hit for your network disk drive, so 60 seconds is recommended. If the file was updated by one process on my machine, we would see the results immediately in another process, but if it was done on another machine, the data would be cached for some amount of time before it actually made it to disk. We were able to work around this problem by adding a call to the Unix 'ls' command on the directory containing the file. Something about the 'ls' command would force the cache to flush the data and we could see results right after that. We found that certain commands would force this "flushing" of the cache, but other commands would not. Using some text editors like 'vi' would always see the results, but 'cat' would not. I hope this helps.

    Derek

  • markbeck

    Thanks for the response, 

    Unfortunately your suggestion doesn't seem to work.

    I'm not convinced that it's entirely NFS since I do not see any of this type of behavior with virtuoso 6.1.4.  Also, I don't see this type of behaviour when I'm doing a simple transient/dc.  I only see this when I'm doing a paramRun() simulation.

    Perhaps something got broken between 6.1.4 and 6.1.5 in regards to how a param run is read?

    Is there another way (inside of Virtuoso) to force the results cache to re-fresh from disk?

    Mark

  • Andrew Beckett
    Hi Mark,

    Not sure why this is happening - please contact customer support - it's important that we get to the bottom of this. I'm travelling to customers for a couple of weeks so have limited opportunities to look into this myself.

    Regards,

    Andrew

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