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add comments to explain why 1 item is added to rendezvous buffers.

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Axel Kohlmeyer
2020-06-19 12:32:11 -04:00
parent 08cb7664a3
commit 3cdf0e286e
1 changed files with 11 additions and 0 deletions
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11
src/comm.cpp
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@ -901,6 +901,8 @@ rendezvous_irregular(int n, char *inbuf, int insize, int inorder, int *procs,
if (inorder) nrvous = irregular->create_data_grouped(n,procs);
else nrvous = irregular->create_data(n,procs);
// add 1 item to the allocated buffer size, so the returned pointer is not NULL
char *inbuf_rvous = (char *) memory->smalloc((bigint) nrvous*insize+1,
"rendezvous:inbuf");
irregular->exchange_data(inbuf,insize,inbuf_rvous);
@ -936,6 +938,8 @@ rendezvous_irregular(int n, char *inbuf, int insize, int inorder, int *procs,
nout = irregular->create_data_grouped(nrvous_out,procs_rvous);
else nout = irregular->create_data(nrvous_out,procs_rvous);
// add 1 item to the allocated buffer size, so the returned pointer is not NULL
outbuf = (char *) memory->smalloc((bigint) nout*outsize+1,
"rendezvous:outbuf");
irregular->exchange_data(outbuf_rvous,outsize,outbuf);
@ -975,6 +979,9 @@ rendezvous_all2all(int n, char *inbuf, int insize, int inorder, int *procs,
if (!inorder) {
memory->create(procs_a2a,nprocs,"rendezvous:procs");
// add 1 item to the allocated buffer size, so the returned pointer is not NULL
inbuf_a2a = (char *) memory->smalloc((bigint) n*insize+1,
"rendezvous:inbuf");
memset(inbuf_a2a,0,(bigint)n*insize*sizeof(char));
@ -1038,6 +1045,7 @@ rendezvous_all2all(int n, char *inbuf, int insize, int inorder, int *procs,
}
// all2all comm of inbuf from caller decomp to rendezvous decomp
// add 1 item to the allocated buffer size, so the returned pointer is not NULL
char *inbuf_rvous = (char *) memory->smalloc((bigint) nrvous*insize+1,
"rendezvous:inbuf");
@ -1079,6 +1087,8 @@ rendezvous_all2all(int n, char *inbuf, int insize, int inorder, int *procs,
if (!outorder) {
memory->create(procs_a2a,nprocs,"rendezvous_a2a:procs");
// add 1 item to the allocated buffer size, so the returned pointer is not NULL
outbuf_a2a = (char *) memory->smalloc((bigint) nrvous_out*outsize+1,
"rendezvous:outbuf");
memory->create(offsets,nprocs,"rendezvous:offsets");
@ -1138,6 +1148,7 @@ rendezvous_all2all(int n, char *inbuf, int insize, int inorder, int *procs,
// all2all comm of outbuf from rendezvous decomp back to caller decomp
// caller will free outbuf
// add 1 item to the allocated buffer size, so the returned pointer is not NULL
outbuf = (char *) memory->smalloc((bigint) nout*outsize+1,"rendezvous:outbuf");