On 2014-08-24, at 22:11, David T. Lewis <lewis at mail.msen.com> wrote:

> On Wed, May 28, 2014 at 11:49:08AM +0200, Bert Freudenberg wrote:
>> On 25.05.2014, at 19:48, David T. Lewis <lewis at mail.msen.com> wrote:
>> 
>>> Performance of the UTC based DateAndTime is generally favorable compared to
>>> the original. Here is what I see on my system (smaller numbers are better).
>>> 
>>> LXTestDateAndTimePerformance test results using the original Squeak DateAndTime
>>> on an interpreter VM:
>>> {
>>> 	#testNow->10143 .
>>> 	#testEquals->30986 .
>>> 	#testGreaterThan->80199 .
>>> 	#testLessThan->75912 .
>>> 	#testPrintString->10429 .
>>> 	#testStringAsDateAndTime->44657
>>> }
>>> 
>>> LXTestDateAndTimePerformance test results using the new UTC based DateAndTime
>>> on an interpreter VM:
>>> {
>>> 	#testNow->6423 .
>>> 	#testEquals->31625 .
>>> 	#testGreaterThan->22999 .
>>> 	#testLessThan->18514 .
>>> 	#testPrintString->12502 .
>>> 	#testStringAsDateAndTime->32912
>>> }
>> 
>> Hi Dave,
>> 
>> just curious: did you test the performance without the LargeInt primitives?
>> 
>> - Bert -
>> 
> 
> Hi Bert,
> 
> Sorry for the extremely late reply. I had never tried the UTC DateAndTime
> without a LargeIntegersPlugin, but I realize now that the question might be
> important for the SqueakJS VM, so a ran some tests using an interpreter VM
> with and without LargeIntegersPlugin.

Interesting. So for old DateAndTime the plugin makes a difference only for testNow, and for the new one not at all. Sounds good to me :)

- Bert -

> The results were not at all what I expected. Very surprisingly (at least
> to me), the plugin seems to make very little difference in the performance of
> the UTC DateAndTime. The UTC DateAndTime seems to be a bit slower on
> printString and equality testing (?), and quite a bit faster on the other
> measures. But the LargeIntegersPlugin does not seem to make much of a
> difference at all.
> 
> Here is what I saw on my machine today.
> 
> Standard DateAndTime, standard VM:
> LXTestDateAndTimePerformance new test. ==>
> {
> 	#testNow->9147 .
> 	#testEquals->28252 .
> 	#testGreaterThan->27358 .
> 	#testLessThan->24664 .
> 	#testPrintString->10955 .
> 	#testStringAsDateAndTime->48505
> }
> 
> Standard DateAndTime, no LargeIntegersPlugin:
> LXTestDateAndTimePerformance new test. ==>
> {
> 	#testNow->28324 .
> 	#testEquals->27985 .
> 	#testGreaterThan->27837 .
> 	#testLessThan->23783 .
> 	#testPrintString->11321 .
> 	#testStringAsDateAndTime->46679
> }
> 
> UTC DateAndTime, standard VM:
> LXTestDateAndTimePerformance new test. ==>
> {
> 	#testNow->5807 .
> 	#testEquals->28168 .
> 	#testGreaterThan->19764 .
> 	#testLessThan->16117 .
> 	#testPrintString->13212 .
> 	#testStringAsDateAndTime->36652
> }
> 
> UTC DateAndTime, no LargeIntegersPlugin:
> LXTestDateAndTimePerformance new test. ==>
> {
> 	#testNow->5759 .
> 	#testEquals->30079 .
> 	#testGreaterThan->19934 .
> 	#testLessThan->16315 .
> 	#testPrintString->14125 .
> 	#testStringAsDateAndTime->38208
> }
> 
> 
> 

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