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From "Joshua McKenzie (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-7001) Windows launch feature parity - augment launch process using PowerShell to match capabilities of *nix launching
Date Tue, 29 Apr 2014 18:04:15 GMT

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Joshua McKenzie commented on CASSANDRA-7001:
--------------------------------------------

While doing some win7 bare-metal vs. ubuntu 14.04 bare-metal performance comparisons I came
across the fact that my env changes broke VisualGC functionality.  Took some digging, but
it turns out that
* the cygwin install I had on my previous win8 config was screwing with the TMP/TEMP environment
variables and getting in the way of .NET's invoking of libraries from powershell.  Clearing
those variables wasn't strictly necessary, and...
* if you clear TMP and TEMP before invoking a jvm, it doesn't know where to put some files
that are necessary for jps, visualgc, and likely some other utilities to work.

I've attached a v2 that fixes that.

As for the performance front - Windows writes look to be about 6% slower than linux at saturation.
 On the read front it looks like Windows is much more CPU-heavy without memory-mapped I/O
than linux - 4 HT haswell peg at 100% on 54 threads vs. linux at 181, however with memory-mapped
index file I/O Windows read performance looks surprisingly good.

I'm planning on shelving performance profiling until after cleaning up the unit and dtests,
but I wanted to have a general baseline of where we are currently as well as confirm no performance
regressions from this patch.

> Windows launch feature parity - augment launch process using PowerShell to match capabilities
of *nix launching
> ---------------------------------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-7001
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7001
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Joshua McKenzie
>            Assignee: Joshua McKenzie
>             Fix For: 2.1 rc1
>
>         Attachments: 7001_v1.txt, 7001_v2.txt
>
>
> The current .bat-based launching has neither the logic nor robustness of a bash or PowerShell-based
solution.  In pursuit of making Windows a 1st-class citizen for C*, we need to augment the
launch-process using something like PowerShell to get as close to feature-parity as possible
with Linux.



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