Re: [Qemu-devel] [PATCH 4/4] json-streamer: Limit number of tokens in addition to total size

[Eric Blake]

On 10/30/2015 01:52 AM, Markus Armbruster wrote:

>>>> I'm assuming you temporarily patched check-qjson to use larger constants
>>>> when you hit your ~100K token testing?  Because I am definitely seeing a
>>>> lot of execution time spent on large_dict when running tests/check-qjson
>>>> by hand, in relation to all the other tests of that file, but not
>>>> minutes worth.  Care to post the diff you played with?
>>>
>>> I tested on a slow machine.
>>
>> I guess it was all the malloc pressure on a low-memory system that would
>> make it so much slower than what I'm seeing, if you stuck with the
>> default gen_test_json(gstr, 10, 100).
> 
> Something must have been wrong with this machine yesterday, because
> today it runs the exact same test much, much faster.  Computers...

Or maybe you had still reverted 65c0f1e9 to figure out where the
regression was at asserting rather than gracefully failing as fixed by
patch 2/4?  Still, even if it is much faster, it is noticeably slow
enough to wonder if we have some inefficiencies beyond the poor memory
usage.

> 
> I'll update the commit message.  Thanks for your sanity check!
> 

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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