These commands report the current state of LaGriT’s dynamic memory allocation. LaGriT arrays are referenced by memory management by a two part name, block name and partition name. It is allocated in integer or real blocks. Each memory block is preceeded by a header and terminated by a trailer. Different platforms will have different values for integer and real word lengths.
Read more on LaGriT memory management at Memory Manager
The following memory command options are recognized:
memory/verify
verify the integerity of LaGriT memory manager storage by checking that the known blocks have not been overwritten. If corruption is detected, an array map will be printed. Nothing is printed if there memory is successfully verified.
memory/print
print an address map of the LaGriT managed arrays. For each array the following is printed; index, length, type, memory address, associated name, and partition. The partition is the grouping of arrays by usage. Common partitions include the mesh object (by name), global memory, and temporary memory for work arrays.
memory/maxmalloc
Report estimate of possible amount of memory available for allocation by LaGriT. This test will make incremental calls to internal LaGriT memory allocation (mmgetblk) until failure. The report will include the total Megabytes where allocation succeeded, and amount at which allocation failed. This command will also print a map of the memory manager storage.
memory / verify
Will be silent if no problems are detected.
memory / print
Sample for 64 bit output showing sizes and allocated memory:
MEMORY SIZES : Sizeof char (type 3) = 1 bytes Sizeof long = 8 bytes Sizeof real*8 (type 2) = 8 bytes Sizeof pointer = 8 bytes Sizeof integer (type 1) = 4 bytes Sizeof INT_PTRSIZE = 8 bytes INDEX LENGTH TYPE ADDRESS NAME PARTITION 29 40000000 2 -14248416 xic cmo1 1 10 3 143632720 global_name global_lg 31 40000000 2 1760710688 zic cmo1 30 40000000 2 2080714784 yic cmo1 Total BYTES = 2.400E+09 Total MEGABYTES = 2.400E+03
memory/maxmalloc
Sample 64 bit output showing max allocation on Ubuntu Linux (this can take awhile before failure):
Looking for malloc to fail, expect errors ....
Allocate blocks of 200000 real values and 1600000.0000000000 bytes
Max unsigned for 32 bit is 4,294,967,295
Max unsigned for 64 bit is 18,446,744,073,709,551,615
Stop test value for allocated bytes is 1.8000000404716257E+019
1 >> 1 number reals = 200000.00000000000 total bytes = 1600000.0000000000
2 >> 1 number reals = 400000.00000000000 total bytes = 3200000.0000000000
3 >> 1 number reals = 800000.00000000000 total bytes = 6400000.0000000000
...
18 >> 1 number reals = 26214400000.000000 total bytes = 209715200000.00000
Killed