During the creation of a recent project the amount of memory used by Blender inflated to a massive(!) 11.8GB while attempting to render. 
This makes rendering on GPU unusable for me (no Titan X's here).
How do I see what is filling up this memory?
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Open a Command Prompt window and navigate to the Blender application folder (e.g. CD "C:\Program Files\Blender Foundation\Blender")
Start Blender with the command blender.exe --debug.
You can now see memory usage by pressing Spacebar and searching for Memory Statistics. This will produce a detailed list of memory usage in the command window used to open Blender:
total memory len: 46.457 MB
peak memory len: 55.115 MB
slop memory len: 5.271 MB
ITEMS TOTAL-MiB AVERAGE-KiB TYPE
223 ( 13.936 63.992) subsurf arena
1498 ( 8.520 5.824) BLI_Mempool Chunk
4 ( 5.881 1505.508) CDNormal
14 ( 4.996 365.455) imb_addrectImBuf
1 ( 3.000 3072.000) OCIO GPU 3D LUT
39 ( 0.923 24.242) Chunk buffer
3779 ( 0.914 0.248) PropertyRNA
1 ( 0.874 895.125) CDMloopCol
2 ( 0.750 384.016) eh buckets
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1$\begingroup$ Wow, this is very impressive. Is there an easier way to do this? Change the .exe launch properties perhaps? $\endgroup$– meed96Apr 19, 2016 at 13:16
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$\begingroup$ Also, for people with the steam version of Blender, you'd need to navigate to C:\Program Files (x86)\Steam\steamapps\common\Blender $\endgroup$– meed96Apr 19, 2016 at 13:17
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$\begingroup$ You could create a shortcut to the executable if that is preferable. $\endgroup$– XtremityApr 19, 2016 at 17:09
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2$\begingroup$ Seems like a very handy feature. Why hide it under debug mode and not allow normal users the chance to monitor their resource utilization. $\endgroup$ Apr 22, 2016 at 12:09
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1$\begingroup$ @AndreySokolov They changed the shortcut, it's F3 now. If it changes again you can search for "Search Menu" in your key-binding. $\endgroup$– Khoa VoNov 1 at 8:56