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    <p>Check with <code>file</code> and <code>ldd</code> that your executable is indeed 64 bits.</p> <p>Check also the resource limits. From inside the process, you could use <a href="http://linux.die.net/man/2/getrlimit" rel="nofollow">getrlimit</a> system call (and <code>setrlimit</code> to change them, when possible). From a <code>bash</code> shell, try <code>ulimit -a</code>. From a <code>zsh</code> shell try <code>limit</code>.</p> <p>Check also that your process indeed eats the memory you believe it does consume. If its pid is 1234 you could try <code>pmap 1234</code>. From inside the process you could read the <code>/proc/self/maps</code> or <code>/proc/1234/maps</code> (which you can read from a terminal). There is also the <code>/proc/self/smaps</code> or <code>/proc/1234/smaps</code> and <code>/proc/self/status</code> or <code>/proc/1234/status</code> and other files inside your <code>/proc/self/</code> ...</p> <p>Check with  <code>free</code> that you got the memory (and the swap space) you believe. You can add some temporary swap space with <code>swapon /tmp/someswapfile</code> (and use <code>mkswap</code> to initialize it).</p> <p>I was routinely able, a few months (and a couple of years) ago, to run a 7Gb process (a huge <code>cc1</code> compilation), under Gnu/Linux/Debian/Sid/AMD64, on a machine with 8Gb RAM.</p> <p>And you could try with a tiny test program, which e.g. allocates with <code>malloc</code> several memory chunks of e.g. 32Mb each. Don't forget to write some bytes inside (at least at each megabyte).</p> <p>standard C++ containers like <code>std::map</code> or <code>std::vector</code> are rumored to consume more memory than what we usually think.</p> <p>Buy more RAM if needed. It is quite cheap these days.</p>
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    1. POWhy the process is getting killed at 4GB?
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    1. USBasile Starynkevitch
    1. USBasile Starynkevitch
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    1. POWhy the process is getting killed at 4GB?
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    1. CO- I used readelf to check my executable and it is 64 bit
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      1. USPiyush Kansal
    2. COI actually suspect (and I was already told) that `std::vector` has significant overhead. I can't be more specific, because I did not dive into libstdc++ source code (it is inside GCC).
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      1. USBasile Starynkevitch
    3. CO- As I already mentioned, memory limit shown by uname is "unlimited". Is there something else you want me to check? - Your suggestion regarding pmap and /prov/self/* is good. I will try that. - I can also try using swapon. But that is also one of my questions, why OS itself it not taking care of it using virtual memory. What is it that a programmer need to worry about it? - In your case, it quite makes sense bcoz u had 8GB and the process required 7GB. My case is just the opposite. - Not sure how malloc will help me out when I already have a program which is dying at 4GB
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      1. USPiyush Kansal
 

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