single-node AR msccl algorithm tuning for MI300 (#1629)

tools/msccl-algorithms/allreduce-allpairs-8n-simple-op.xml

@@ -1,4 +1,4 @@
-<algo name="allreduce_pairs" proto="Simple" nchannels="8" nchunksperloop="512" ngpus="8" coll="allreduce" inplace="0" outofplace="1" minBytes="524288" maxBytes="16777216">
+<algo name="allreduce_pairs" proto="Simple" nchannels="8" nchunksperloop="512" ngpus="8" coll="allreduce" inplace="0" outofplace="1" minBytes="524288" maxBytes="20971520">
   <gpu id="0" i_chunks="512" o_chunks="512" s_chunks="448">
     <tb id="0" send="-1" recv="-1" chan="0">
       <step s="0" type="cpy" srcbuf="i" srcoff="0" dstbuf="o" dstoff="0" cnt="8" depid="-1" deps="-1" hasdep="1"/>

tools/msccl-algorithms/allreduce-allpairs-8n-simple.xml

@@ -1,4 +1,4 @@
-<algo name="allreduce_pairs" proto="Simple" nchannels="8" nchunksperloop="512" ngpus="8" coll="allreduce" inplace="1" outofplace="0" minBytes="524288" maxBytes="11534336">
+<algo name="allreduce_pairs" proto="Simple" nchannels="8" nchunksperloop="512" ngpus="8" coll="allreduce" inplace="1" outofplace="0" minBytes="524288" maxBytes="20971520">
   <gpu id="0" i_chunks="512" o_chunks="0" s_chunks="448">
     <tb id="0" send="-1" recv="-1" chan="0">
       <step s="0" type="nop" srcbuf="i" srcoff="-1" dstbuf="o" dstoff="-1" cnt="0" depid="16" deps="1" hasdep="0"/>