I have a NT Service crashed after run for one day,it caused by "out of memory exception";When i analyzed the dump file, i found the gcheap was only about 160MB，and the native heap was about 300MB,but the virtual memory which type is "RegionUsageIsVAD" was about 1.3GB. however I searched my source code,there's no "virtualalloc" api call,I can't understand why the virtual memory usage was high,but the usage of gcheap and native heap was low. Thanks!
the dump report as below:
0:067> !eeheap -gc
Number of GC Heaps: 1
generation 0 starts at 0x72dff784
generation 1 starts at 0x72d564f8
generation 2 starts at 0x01441000
ephemeral segment allocation context: (0x732ff78c, 0x732ff798)
segment begin allocated size
01440000 01441000 02419368 0xfd8368(16614248)
070a0000 070a1000 0808a904 0xfe9904(16685316)
090b0000 090b1000 0a09e4dc 0xfed4dc(16700636)
0a480000 0a481000 0b46bf18 0xfeaf18(16690968)
16f50000 16f51000 17f35e64 0xfe4e64(16666212)
186f0000 186f1000 196ec5e4 0xffb5e4(16758244)
196f0000 196f1000 1a6d5284 0xfe4284(16663172)
47240000 47241000 481b296c 0xf7196c(16193900)
72ac0000 72ac1000 732ff78c 0x83e78c(8644492)
Large object heap starts at 0x02441000
segment begin allocated size
02440000 02441000 033d0fd8 0xf8ffd8(16318424)
2f450000 2f451000 2f791040 0x340040(3407936)
Total Size: Size: 0x99de83c (161343548) bytes.
------------------------------
GC Heap Size: Size: 0x99de83c (161343548) bytes.
-------------------- Usage SUMMARY --------------------------
TotSize ( KB) Pct(Tots) Pct(Busy) Usage
4fe0c000 ( 1308720) : 62.41% 70.56% : RegionUsageIsVAD
ec9d000 ( 242292) : 11.55% 00.00% : RegionUsageFree
9922000 ( 156808) : 07.48% 08.45% : RegionUsageImage
6dfe000 ( 112632) : 05.37% 06.07% : RegionUsageStack
0 ( 0) : 00.00% 00.00% : RegionUsageTeb
10e26000 ( 276632) : 13.19% 14.91% : RegionUsageHeap
0 ( 0) : 00.00% 00.00% : RegionUsagePageHeap
1000 ( 4) : 00.00% 00.00% : RegionUsagePeb
0 ( 0) : 00.00% 00.00% : RegionUsageProcessParametrs
0 ( 0) : 00.00% 00.00% : RegionUsageEnvironmentBlock
Tot: 7fff0000 (2097088 KB) Busy: 71353000 (1854796 KB)
-------------------- Type SUMMARY --------------------------
TotSize ( KB) Pct(Tots) Usage
ec9d000 ( 242292) : 11.55% : <free>
a440000 ( 168192) : 08.02% : MEM_IMAGE
ffd000 ( 16372) : 00.78% : MEM_MAPPED
65f16000 ( 1670232) : 79.65% : MEM_PRIVATE
-------------------- State SUMMARY --------------------------
TotSize ( KB) Pct(Tots) Usage
64112000 ( 1639496) : 78.18% : MEM_COMMIT
ec9d000 ( 242292) : 11.55% : MEM_FREE
d241000 ( 215300) : 10.27% : MEM_RESERVE
Largest free region: Base 61d20000 - Size 00d60000 (13696 KB)