On 32-bit Windows, you cannot reserve more than 2G (unless you reboot Windows into a special mode where you can use 3G). Often, not even 1.5G are possible due to user-space libraries fragmenting the address space. My guess is that this is happening on your side, and that Fiji is trying to restart reserving a smaller amount of memory. You should see a message to that end, at least when starting Fiji from the command-line with the option "--console".

Unless your CPU is 64-bit (in which case you can switch to fiji-win64), there is not much we can do, I am afraid...

Hi Johannes,

i am not sure about your answer. We tried to serve 500MB or 1532MB or ...

The problem is, even so the entry inside the ijm.cfg file is changed, after the restart of Fiji, the old value 758MB was recoverd from somewhere ...

And today I tested on my on PC (WinXP 32 bit). There Fiji displays 1532MB. I tried to change it to 500MB, but no sucess.
After the restart I ended up with the 1532MB again. So We have no idea, where Fiji recovered this old value from?

Cheers,

Sebi

Hi Johannes,

we tested an older Fiji (the orignal release for March). And there there it works fine. We can change the memory and it works. So something broko afterwards.
I also tried editing my FIJI shortcut to:

"C:\Programme\TILL Photonics\Live Acquisition\Fiji\fiji-win32.exe" --mem 1528m

And after starting FIJI we got 1524MB memory, which is fine.

Cheers, Sebastian

Thanks for investigating further. Unfortunately, I lack the time to dive into that detail these days, so hopefully somebody else will be able to look into this.

Hi,

since today my Fiji (up-to-date) is only able to allocate 896MB of memory and all attempts to change this do not work.
- I tried to set the memory bach to 1500MB (I use Windows XP with 3GB RAM) from inside FIJI --> no sucess, after the restart = 896MB
- I tried to edit the ijm.cfg file and restarted FIJI --> no sucess, 896MB
- and I tried to start FIJI from the command line " ...\Fiji\fiji-win32.exe --mem=1500m --< but no sucess, after the restart = 896MB

And now I ran out of ideas what the problem might be. A while ago I submitted a bug (ID 305). After doing that I added "--mem=1500m" to my FIJI shortcut. and that solution worked until yesterday. And now I am stuck with 896MB which is quite limiting for what I do. 

Have you had a chance to start Fiji with the --console option? I am pretty certain that it tries to reserve as much heap as you ask it to, but fails, settling for less. Most likely another application got in the way and "fragments" the memory, i.e. disallows Java to use as much contiguous memory as it wants to.

Hi Johannes,

I have the same problem under WindowsXP64 and Windows7-64, he simply ignores the memory settings, for example I also cannot set it to a lower value than the default one ...

Hi,

i tried some things to pin down the problem.

- I shut down all unnecessary windows applications.
- I downlodead the FIJI relaese from the homepage and started Fiji --> 1532MB are the limit --> OK
- I ran Fiji´s updater --> end up with ImageJA 1.45k and all plugins updated --> 1148MB limit is now the limit

So a change within Fiji itself causes the decreased memory allocation?

And I started my normal ImageJ (ImageJA 1.45k) and end up with 1532MB limit, which is fine.

Hope this helps a bit.

Sebi

What does --console --dry-run show?

Hi,

i found out some more things. When I start Fiji via:

...\Fiji\fiji-win32.exe --system

the memory limit is 1532MB, which is fine. And to my knowledge the --system option forces fiji to use the installed windows JVM, which is 1.6.0_22. And my Fiji uses 1.6.0_24.

By the way, the update java option from the updater gives me an error:

Could not find form of method 'post' in http://oracle.com/technetwork/java/javase/downloads/index.html

Cheers,

Sebi

-- console --dry-run shows:

C:\Programme\TILL Photonics\Live Acquisition\Fiji>javaw -Dpython.cachedir.skip=true -Dplugins.dir=C:
\\LIVEAC~1\\Fiji -Xmx1536m -Xincgc -XX:PermSize=128m -Djava.class.path=C:\\PROGRA~1\\TILLPH~1\\LIVEA
jar;C:\\PROGRA~1\\TILLPH~1\\LIVEAC~1\\Fiji/jars/ij.jar -Dsun.java.command=Fiji -Dfiji.dir=C:\\PROGRA
~1\\Fiji -Dfiji.defaultLibPath=bin/client/jvm.dll -Dfiji.executable=fiji-win32.exe -Djava.library.pa
LPH~1\\LIVEAC~1\\Fiji/lib/win32 -Dsun.java2d.noddraw=true fiji.Main -port7

I just fixed this in commit http://fiji.sc/cgi-bin/gitweb.cgi?p=fiji.git;a=commitdiff;h=313b2b70a665b00c5c273c54cf026b085512525b

Please download http://fiji.sc/snaps/fiji-win32.exe (or fiji-win64.exe) and test.

Ah, no complaints in over a month! That surely means that the bug is fixed.