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POHow can a program have a high virtual byte count while the private bytes are relatively low on Windows 32-bit?
 

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  1. POHow can a program have a high virtual byte count while the private bytes are relatively low on Windows 32-bit?
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    <p>I'm trying to get a better understanding of how Windows, 32-bit, calculates the virtual bytes for a program. I am under the impression that Virtual Bytes (VB) are the measure of how much of the user address space is being used, while the Private Bytes (PB) are the measure of actual committed and reserved memory on the system.</p> <p>In particular, I have a server program I am monitoring which, when under heavy usage, will climb up to the 3GB limit for VBs. Around the same time the PB climb as well, but then quickly drop down to around 1 GB as the usage drops. The PB tend to then stay low, around the 1 GB mark, but the VB stay up around the 3 GB mark. I do not have access to the source code, so I am just using the basic Windows performance counters to monitor all of this. From a programming point of view, what memory concept do I not understand that makes this all possible? Is there a good reference to learn more about this?</p>
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