Frank, I agree that the amount is small per file, but in our application we need to keep thousands of files open, and keep memory consumption to a certain limit. I have another question regarding the stripped file. When I open a large stripped file, the memory rises by almost 1 MB. I assume this is caused by some sort of caching. When I open hundreds of such files, the amount of memory is multiplied. Can I limit this amount?
Yehiyam Sent from my mobile ----------------------------- From: "Frank Warmerdam" Subject: Re: [gdal-dev] Memory usage for GetProjectionRef Date: 06 אוקטובר 2010 00:35 Livneh Yehiyam wrote: > Hi I'm sorry if I was misunderstood, but these are not leaks I'm worried > about, but rather I'm trying to understand the memory consumption of the > various GDAL calls I use. I didn't notice any leak, and I trust you test for > leaks all the time. Livney, We don't check for memory leaks all the time or comprehensively. But regular use of GeoTIFF it one of the most frequently leak tested things. > Take for example the first two examples below. These two > are the same image, with and without the pyramid (overviews). Why should the > call to GetProjectionRef raise the memory of the application by a different > amount? In the case of pyramids at the end of Open the "last directory" which is likely the top level of the pyramid will be the active directory. Calling GetProjectionRef() causes a switch of context back to the base pyramid level to fetch the projection tags. The base directory is typically larger since it will have the projection, other metadata and bigger tile offset/size arrays. If these aren't leaks and the amounts of memory are modest why does it matter what details are happening internally? The behavior of the GeoTIFF driver is fairly complex for some good, and some bad reasons. Trying to understand the details of it's operation - especially by observing memory use - is likely to be frustrating. Best regards, -- ---------------------------------------+-------------------------------------- I set the clouds in motion - turn up | Frank Warmerdam, [email protected] light and sound - activate the windows | http://pobox.com/~warmerdam and watch the world go round - Rush | Geospatial Programmer for Rent ********************************************************************************************** This message (including any attachments) issued by RAFAEL- ADVANCED DEFENSE SYSTEMS LTD. (hereinafter "RAFAEL") contains confidential information intended for a specific individual and purpose, may constitute information that is privileged or confidential or otherwise protected from disclosure. If you are not the intended recipient, you should contact us immediately and thereafter delete this message from your system. You are hereby notified that any disclosure, copying, dissemination, distribution or forwarding of this message, or the taking of any action based on it, is strictly prohibited. If you have received this e-mail in error, please notify us immediately by e-mail mailto:[email protected] and completely delete or destroy any and all electronic or other copies of the original message and any attachments thereof. **********************************************************************************************
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