There is indeed a hard limit of 512MB in the Windows VM currently in
effect, which is the result of debugging some extremely strange effects
when loading DLLs. What we found was that on some systems, under some
circumstances (related to memory load etc) DLLs would not be loaded if
we'd reserve more than 512MB of memory leading the application either to
not start at all, or to cause weird effects at later points etc.
Cheers,
- Andreas
On 9/4/2010 2:14 AM, Mariano Martinez Peck wrote:
You can also ask in VM mailing list. I cc'ed them.
On Sat, Sep 4, 2010 at 4:52 AM, Jimmie Houchin <[email protected]
<mailto:[email protected]>> wrote:
Hello,
Sorry for the delay in reply. For some reason the first time I
looked at your message in my newsreader (Thunderbird/GMane) the
message was in French and written to someone else. Apparently the
software did something strange.
To answer your question. Yes. I tried this in both the standard vm
and the standard Pharo 1.1 image.
I start the vm/image with -memory: 1000
and open a new Workspace, then copy the below memory settings and doit.
I then do a := Array new: 100000000.
That seemingly succeeds but only takes me up to a little below 500mb
ram. If I attempt to do another array of another 100,000,000
objects, I get the Low Space error.
With the standard vm and image, it just sits there consuming cpu
with simply doing the array initialization. I am on a quad core
server with 6gm ram and it has currently consumed over 36 cpu
minutes of one of the cores. At this point I quit the image. I could
do things in the UI but it is not very responsive.
In the Cog vm/image, the array creation returns almost immediately
and waits for other instructions.
As I write this I have to go back to Squeak 3.7.1vm and either the
3.8 or 3.10 image, for it to be successful. Outside of that I can't
get past 500mb of ram. This server generally sits at only using 30%
of ram.
For enterprise/business endeavors, I thing Pharo really needs to be
able to use all the memory the OS will allow it. I know that it
being a 32 bit app does create some limits on some OSes. But neither
of my Vista machines imposes a limit that I can't live with at the
moment.
Thanks for your reply. I am neither a vm nor Smalltalk expert so I
don't know how to proceed from here outside of reducing my
applications memory needs by putting more into the database and only
having the data in memory that is absolutely necessary for the
analysis I am attempting.
Jimmie
On 9/1/2010 4:48 AM, Stéphane Ducasse wrote:
do you have the same problem with the normal VM?
On Sep 1, 2010, at 5:25 AM, Jimmie Houchin wrote:
Hello,
I am developing an application which processes and generates
a large amount of data. In a recent attempt I encountered an
Space is Low error.
This is occurring in a Pharo 1.1 image using the latest
Pharo and Cog VMs. I am opening the vm with the -memory:
1000 parameter.
The below code I have applied the from the Squeak list from
the 100 Million Objects thread. But the problem occurs at
about 500mb of ram on a computer with 3 (or 6) gb of ram,
with only 65% of physical ram in use. The os is Vista.
Any help in using more memory, as much as necessary for the
app, would be greatly appreciated.
initializeMemorySettings
"Initialize the memory and GC settings to be more in line
with QF requirements"
"The following settings affect the rate incremental GCs and
tenuring"
"Limit incremental GC activity to run every 40k allocations"
SmalltalkImage current vmParameterAt: 5 put: 40000.
"allocations between GCs (default: 4000)"
"Limit tenuring threshold to only tenure w/> 10k survivors"
SmalltalkImage current vmParameterAt: 6 put: 10000.
"tenuring threshold (default: 2000)"
"These settings affect overall memory usage"
"Only give memory back to the OS when we have more than 16MB
free"
SmalltalkImage current vmParameterAt: 24 put:
16*1024*1024. "default 8MB"
"Try to keep 8MB headroom at all times"
SmalltalkImage current vmParameterAt: 25 put: 8*1024*1024.
"default 4MB"
"These settings describe what to do when we're close to
running out of free space"
"Tell the VM that we'd rather grow than spinning in tight GC
loops"
SmalltalkImage current gcBiasToGrow: true. "default: false"
"Tell the VM to do a fullGC for good measure if the above
growth exceeded 16MB"
SmalltalkImage current gcBiasToGrowLimit: 16*1024*1024.
"default: 0"
Thanks,
Jimmie Houchin
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