Add the acoll component #12484

amd-nithyavs · 2024-04-22T17:57:05Z

This PR introduces "acoll", a high-performant collective component that is optimized for communications within a single node of AMD EPYC CPUs. It mainly uses subcommunicators based on l3cache or numa to reduce cross-cache or cross-numa accesses. The supported collectives include Bcast, Allreduce, Gather, Reduce, Barrier, Allgather.

OSU micro-benchmarks were run on 2-socket AMD EPYC 9654 96-Core Processor with 4 NUMA domains per socket, with a total of 192 cores per node, on top of commit bb7ecde.
Average percentage latency reduction over "tuned" across 32, 64, 96, 128, 192 ranks over message sizes of 8 bytes to 8 MB (varied in powers of 2):

Allreduce: 37.7%
Bcast: 39.4%
Gather: 27.5%

Sample graphs:

Allreduce

Bcast

Gather

bosilca · 2024-04-22T18:04:57Z

How this compares with #10470 ?

edgargabriel · 2024-04-22T18:06:24Z

How this compares with #10470 ?

We can discuss it at the meeting. Part of the goal of filing the pr was to give people the ability to have a look at it ahead of the meeting if they want/can.

juntangc · 2024-04-26T15:25:16Z

ompi/mca/coll/acoll/Makefile.am

Do you have plan to add alltoall(v) to acoll?

Yes, we are planning to add alltoall to acoll next.

juntangc · 2024-04-26T16:13:25Z

ompi/mca/coll/acoll/coll_acoll_allgather.c

+ *              chosen, further decides if [ring|lin] allgather is to be used.
+ *
+ */
+static inline void coll_allgather_decision_fixed(int size, size_t total_dsize, int sg_size,


can you shed some lights on how to choose which methods for other intel/amd achitectures? you might also want some utility to let the user to adjust the decisions according for other systems.

Our testing has been mostly focused on Zen architectures, we will soon test on other architectures. We do not have the utility/config option to override decisions, we will plan to add it.

juntangc · 2024-04-26T16:19:57Z

ompi/mca/coll/acoll/README

@@ -0,0 +1,15 @@
+Copyright (c) 2023-2024 Advanced Micro Devices, Inc. All rights


have you thought about what needs to be done to extend this for multiple nodes?

Some of the APIs (like bcast, barrier, allgather) support multi-node case. However, it is not extensively tested for multi-node, we will test them and extend other APIs also to multi-node.

juntangc · 2024-04-26T16:28:22Z

ompi/mca/coll/acoll/coll_acoll_allgather.c

+/*
+ * rd_allgather_sub
+ *
+ * Function:    Uses recursive doubling based allgather for the group.


have you compared the performance of other methods, besides recursive doubling?

Yes, acoll/allgather chooses among recursive doubling, ring and linear based on process count and message sizes.

juntangc · 2024-04-26T16:37:12Z

ompi/mca/coll/acoll/coll_acoll_allgather.c

+    }
+
+    /* This barrier is needed to prevent random hangs */
+    err = ompi_coll_base_barrier_intra_tree(comm, module);


Why the barrier is needed here? This barrier will also add cost to small message allgather.

It is removed now.

juntangc · 2024-04-26T16:45:41Z

ompi/mca/coll/acoll/coll_acoll_allreduce.c

+        if (sbuf != MPI_IN_PLACE)
+            memcpy(tmp_rbuf, sbuf, my_count_size * dsize);
+    } else {
+        ompi_3buff_op_reduce(op, (char *) data->xpmem_saddr[0] + chunk * rank * dsize,


is the 3 operator reduce function to maintain the order?

I think this was a bit faster than copying the chunks first and then reducing later in the following "for" loop.

bosilca · 2024-04-29T20:31:27Z

Please rebase to current main to get rid of the mpi4py failure.

wenduwan · 2024-04-30T19:40:55Z

I tested the PR in AWS CI. I'm seeing assertion errors with --enable-debug

# [ pairs: 18 ] [ window size: 64 ]
# Size                  MB/s        Messages/s
osu_mbw_mr: coll_acoll_allgather.c:391: mca_coll_acoll_allgather: Assertion `subc->local_r_comm != NULL' failed.

You can try osu_mbw_mr.

hppritcha · 2024-05-01T18:44:46Z

@amd-nithyavs could you rebase this PR to see if that clears up the mpi4py CI failure?

mshanthagit · 2024-05-01T18:50:24Z

@amd-nithyavs could you rebase this PR to see if that clears up the mpi4py CI failure?

@hppritcha we did have issues after rebase. Have fixed the issues, will update the PR soon. Thanks.

mshanthagit · 2024-05-01T18:52:17Z

I tested the PR in AWS CI. I'm seeing assertion errors with --enable-debug
# [ pairs: 18 ] [ window size: 64 ]
# Size                  MB/s        Messages/s
osu_mbw_mr: coll_acoll_allgather.c:391: mca_coll_acoll_allgather: Assertion `subc->local_r_comm != NULL' failed.
You can try osu_mbw_mr.

The updated PR (yet to be pushed) will fix this issue. Thanks.

amd-nithyavs · 2024-05-08T04:49:39Z

I tested the PR in AWS CI. I'm seeing assertion errors with --enable-debug
# [ pairs: 18 ] [ window size: 64 ]
# Size                  MB/s        Messages/s
osu_mbw_mr: coll_acoll_allgather.c:391: mca_coll_acoll_allgather: Assertion `subc->local_r_comm != NULL' failed.
You can try osu_mbw_mr.

The issue is fixed in the updated PR.

amd-nithyavs · 2024-05-08T04:50:37Z

@amd-nithyavs could you rebase this PR to see if that clears up the mpi4py CI failure?

We have updated the PR, it passes the mpi4py tests.

wenduwan · 2024-05-08T13:37:52Z

Running AWS CI

wenduwan · 2024-05-08T13:39:22Z

@amd-nithyavs I noticed that the PR is currently split into 3 commits. Please squash them before merging.

wenduwan · 2024-05-08T16:50:54Z

Passed AWS CI. Note that we don't test with xpmem.

github-actions · 2024-05-10T05:43:51Z

Hello! The Git Commit Checker CI bot found a few problems with this PR:

2f7c5e2: Merge latest of local ompiv5

check_signed_off: does not contain a valid Signed-off-by line

Please fix these problems and, if necessary, force-push new commits back up to the PR branch. Thanks!

amd-nithyavs · 2024-05-10T06:02:09Z

@wenduwan We have rebased to the latest and squashed the commits.

wenduwan

Reviewed a couple files. Haven't looked into the algorithm themselves yet. Will pick up later.

wenduwan · 2024-05-15T14:20:31Z

ompi/mca/coll/acoll/LICENSE.md

@@ -0,0 +1,11 @@
+Copyright (C) 2024, Advanced Micro Devices, Inc. All rights reserved.


In general, the copyright notice format in ompi is

Copyright (c) YYYY[-YYYY] Entity etc.

Will change in the updated patch

wenduwan · 2024-05-15T14:25:57Z

ompi/mca/coll/acoll/configure.m4

+AC_DEFUN([MCA_ompi_coll_acoll_CONFIG],[
+        AC_CONFIG_FILES([ompi/mca/coll/acoll/Makefile])
+
+        # ToDo: Check for a proper way to pass args 1 and 2


Could you please explain what this TODO means? Positional arguments can be accesses in shell style, e.g. $1 $2.

We can remove TODO. We want acoll to build with or without xpmem, this comment was to check if there is a better way to than " OPAL_CHECK_XPMEM([coll_acoll], [should_build=1], [should_build=1])". Passing $1 $2 wouldn't build acoll if xpmem is not present.

wenduwan · 2024-05-15T14:34:10Z

ompi/mca/coll/acoll/coll_acoll_utils.h

+    return temp_ptr;
+}
+
+static inline void coll_acoll_free(coll_acoll_reserve_mem_t *reserve_mem_ptr, void *ptr)


IMO the function name could be more specific.

Also I don't quite understand coll_acoll_reserve_mem_t. It looks to me that each instance tracks a single memory allocation. Since coll_acoll_reserve_mem_t.reserve_mem already points to the allocation, why does the caller have to pass in the ptr again?

We use coll_acoll_reserve_mem_t to track the use of a pre-allocated memory. However, when the requested size during coll_acoll_malloc() is greater than that of the pre-allocated memory, we allocate new memory, which needs to be then freed during coll_acoll_free(). Hence the need to pass ptr.

wenduwan · 2024-05-15T14:39:48Z

ompi/mca/coll/acoll/coll_acoll_utils.h

+    }
+}
+
+static inline int log_sg_bcast_intra(void *buff, int count, struct ompi_datatype_t *datatype,


IIUC the *sg_bcast_intra functions are only used in allgather, so should they be moved to allgather file?

I don't have a strong opinion, but it caught my eye that we are doing actual collectives in utils - that's unusual.

Agree, will move to allgather.

wenduwan · 2024-05-15T14:44:22Z

ompi/mca/coll/acoll/coll_acoll_utils.h

+    if ((false == reserve_mem_ptr->reserve_mem_allocate)
+        || (false == reserve_mem_ptr->reserve_mem_in_use)) {
+        if (NULL != ptr) {
+            free(ptr);


I think the NULL check should be moved to the top of the function. But please see my comment about coll_acoll_reserve_mem_t - maybe we don't need ptr at all.

Please see the reply to the previous comment on coll_acoll_reserve_mem_t. Since ptr will be the same as reserve_mem (the pre-allocated memory) when the memory size needed is less than or equal to that of the pre-allocated memory, the null check should be inside to ensure it is the case corresponding to a new buffer.

wenduwan · 2024-05-15T15:48:20Z

ompi/mca/coll/acoll/coll_acoll_utils.h

+                ret = -1;
+                goto error_hndl;
+            }
+            sprintf(rc_name, "acoll_%d_%d_%d", cid, rank, i);


nit If we care about the name length then we should consider snprintf instead of sprintf

wenduwan · 2024-05-15T15:49:27Z

ompi/mca/coll/acoll/coll_acoll_utils.h

+
+            data->rcache[i] = mca_rcache_base_module_create("grdma", NULL, &rcache_element);
+            if (data->rcache[i] == NULL) {
+                printf("Error in rcache create\n");


Reminder to clean up printf in this PR.

wenduwan · 2024-05-15T15:57:30Z

ompi/mca/coll/acoll/coll_acoll.h

+#    include "opal/mca/rcache/base/base.h"
+#    include <xpmem.h>


nit I don't think we need to indent includes.

Agree, will fix it.

wenduwan · 2024-05-15T15:58:21Z

ompi/mca/coll/acoll/coll_acoll.h

+
+END_C_DECLS
+
+#define MCA_COLL_ACOLL_MAX_CID            100


See my other comment about CID. I'm not sure if it is intended to be used in collectives.

wenduwan · 2024-05-15T16:10:58Z

ompi/mca/coll/acoll/coll_acoll_allreduce.c

+}
+#endif
+
+void mca_coll_acoll_barrier(coll_acoll_data_t *data, int offset, int *group, int gp_size, int rank,


This function seems to be at the wrong file.

Will rename the function, this is not a generic MPI barrier function, it is used internallly for small message allreduce only

mshanthagit · 2024-05-21T14:01:01Z

@wenduwan we have addressed the comments and incorporated some big count related changes as well.

wenduwan

Looked at allgather. Left a few comments.

wenduwan · 2024-05-30T16:42:56Z

ompi/mca/coll/acoll/coll_acoll_allgather.c

+    for (i = msb_pos + 1, mask = 1 << i; i <= dim; ++i, mask <<= 1) {
+        peer = sub_rank | mask;
+        if (peer >= sg_size) {
+            continue;


Peer is monotonically increasing in the loop. At this point you should be able to break instead of continue.

Also, peer is signed - wouldn't sub_rank | mask somehow change the sign bit and make it negative?

Overall there are a lot of bit magic, which I'm not good at. Need to get seconds opinions.

Yes, we can change the continue to break.
Since size is int, sub_rank, mask and hence peer will be ensured to be within the positive int range.

No magic 🙂, the logic is similar to the one in mca_coll_basic_bcast_log_intra().

wenduwan · 2024-05-30T17:12:56Z

ompi/mca/coll/acoll/coll_acoll_allgather.c

+        for (peer = sg_start; peer <= sg_end; peer++) {
+            if (peer == cur_base) {
+                continue;
+            }


In general we prefer the trick to iterate peers starting from rank+1 and wrap around to rank-1.

Ack, will modify.

wenduwan · 2024-05-30T17:23:45Z

ompi/mca/coll/acoll/coll_acoll_allgather.c

+            int send_peer = ((adj_rank - i + subgrp_size) % subgrp_size) + sg_start;
+
+            tmprecv = (char *) rbuf + (ptrdiff_t) recv_peer * (ptrdiff_t) rcount * rext;
+            tmpsend = (char *) rbuf + (ptrdiff_t) send_peer * (ptrdiff_t) rcount * rext;


Could you explain why tmpsend is using rbuf?

Here we are using the ring algorithm where at each step, the rank sends the data it received in the previous step. Since rbuf contains the data received by the rank, it is used to derive tmpsend.

wenduwan · 2024-05-30T17:27:12Z

ompi/mca/coll/acoll/coll_acoll_allgather.c

+ *              ompi_coll_base_allgather_intra_recursivedoubling().
+ *
+ */
+static inline int rd_allgather_sub(void *rbuf, struct ompi_datatype_t *rdtype,


Why doesn't this function take sbuf?

The relevant data from sbuf is copied to rbuf at the beginning of mca_coll_acoll_allgather_intra(), so it does not need sbuf.

wenduwan · 2024-05-30T17:29:42Z

ompi/mca/coll/acoll/coll_acoll_allgather.c

+int mca_coll_acoll_allgather(const void *sbuf, size_t scount, struct ompi_datatype_t *sdtype,
+                             void *rbuf, size_t rcount, struct ompi_datatype_t *rdtype,
+                             struct ompi_communicator_t *comm, mca_coll_base_module_t *module)


Overall I'm confused about the use of sbuf vs rbuf and MPI_IN_PLACE handling. Please see my other comments.

mshanthagit · 2024-06-04T16:40:29Z

@bosilca @devreal could you please review the PR as well? Wenduo has also provided an initial set of comments which we have addressed.

Thanks,
Manu

lrbison

I have reviewed this again. It is a lot of changes so I didn't dive particularly deep, but nothing stood out to me as needing to be addressed immediately. LGTM.

lrbison · 2024-07-08T21:39:04Z

ompi/mca/coll/acoll/coll_acoll_allreduce.c

+    if (rank == group[0]) {
+        __atomic_store_n((int *) ((char *) data->allshmmmap_sbuf[group[0]] + offset
+                                  + 64 * group[0]),
+                         val, __ATOMIC_RELAXED);
+    }
+
+    while (tmp0 != val) {
+        tmp0 = __atomic_load_n((int *) ((char *) data->allshmmmap_sbuf[group[0]] + offset
+                                        + 64 * group[0]),
+                               __ATOMIC_RELAXED);
+    }
+
+    if (rank != group[0]) {
+        val++;
+        __atomic_store_n(tmp, val, __ATOMIC_RELAXED);
+    }


Reading this I see we don't have __atomic_store_n or __atomic_load_n in opal. XHC runs into this too:

ompi/ompi/mca/coll/xhc/coll_xhc_atomic.h

Line 47 in ff12b69

#if OPAL_USE_GCC_BUILTIN_ATOMICS || OPAL_USE_C11_ATOMICS

. Maybe something we can patch up in the future to provide opal_atomic_load or something.

lrbison · 2024-07-08T21:56:22Z

ompi/mca/coll/acoll/coll_acoll_utils.h

+#include "opal/include/opal/align.h"
+
+/* Function to allocate scratch buffer */
+static inline void *coll_acoll_buf_alloc(coll_acoll_reserve_mem_t *reserve_mem_ptr, uint64_t size)


Do you find these functions improve performance much? I found that malloc will behave much like this if malloc_opt is used to set the MALLOC_MMAP_MAX threshold and MALLOC_TRIM_THRESHOLD up to the same size you have here (4MB).

(MMAP'ed memory size is default 128K, and if malloc returns memory using mmap, the memory will be immediately free'd on return)

For gather, we found this to improve performance over malloc.

bosilca

Please add the owner.txt file.

ompi/mca/coll/acoll/LICENSE.md

ompi/mca/coll/acoll/coll_acoll.h

bosilca · 2024-07-09T21:37:01Z

ompi/mca/coll/acoll/coll_acoll_barrier.c

+    int cid = ompi_comm_get_local_cid(comm);
+
+    /* Fallback to linear if cid is beyond supported limit */
+    if (cid >= MCA_COLL_ACOLL_MAX_CID) {


I noticed @wenduwan comment above, and overall he is correct. But I have a more fundamental question here: what exactly are you trying to achieve with this test ? Only provide support with acoll for the first MCA_COLL_ACOLL_MAX_CID communicators ? How do you define those globally to make sense in distributed, not symmetric, applications ?

Yes, currently support is provided for the first 100 communicators. We will have a follow-up patch where we remove this dependency.
Didn't quite understand "How do you define those globally to make sense in distributed, not symmetric, applications ?" Could you please elaborate?

bosilca · 2024-07-09T21:58:42Z

ompi/mca/coll/acoll/coll_acoll_gather.c

+ * Memory:      The base rank of each subgroup may create temporary buffer.
+ *
+ */
+int mca_coll_acoll_gather_intra(const void *sbuf, size_t scount, struct ompi_datatype_t *sdtype,


I don't understand how is this better than gather in HAN ? HAN will split the communicator in two, node-level and inter-nodes, and will then do a local gather, and then an inter-node gather with data reshuffling. This algorithm seems to assume a map-by core distribution across the entire communicator. How is that applicable to sub-communicators ?

Yes, the gather algorithm is optimal for -map-by core option. For subcommunicators, the same algorithm is used which may not be optimal.

amd-nithyavs · 2024-07-16T09:55:27Z

Please add the owner.txt file.

Ack

edgargabriel · 2024-07-16T15:40:54Z

bot:retest

ompi/mca/coll/acoll/coll_acoll_utils.h

devreal · 2024-07-17T14:57:20Z

ompi/mca/coll/acoll/coll_acoll_utils.h

+    data->offset[0] = 16 * 1024;
+    data->offset[1] = data->offset[0] + size * 64;
+    data->offset[2] = data->offset[1] + size * 64;
+    data->offset[3] = data->offset[2] + rank * 8 * 1024;


Where do these magic numbers come from? What offsets do they encode?

Updated in the lastest push.

devreal · 2024-07-17T14:58:31Z

ompi/mca/coll/acoll/coll_acoll_utils.h

+    int offset = 16 * 1024;
+    memset(((char *) data->allshmmmap_sbuf[data->l1_gp[0]]) + offset + 64 * rank, 0, 64);
+    if (data->l1_gp[0] == rank) {
+        memset(((char *) data->allshmmmap_sbuf[data->l2_gp[0]]) + (offset + 64 * size) + 64 * rank,
+               0, 64);
+    }


Same here. I'd prefer to have names for numbers instead of magic numbers strewn across the code.

devreal · 2024-07-17T21:35:51Z

ompi/mca/coll/acoll/coll_acoll_allgather.c

+    ompi_datatype_type_size(datatype, &dsize);
+    total_dsize = dsize * count;
+
+    if (total_dsize <= 8192) {


It seems like 8192 comes up often here. Why was that chosen? Is that related to cache sizes? Should this be a #define constant?

These numbers / conditions are empirically derived. I don't think we should #define these.

devreal · 2024-07-17T21:37:58Z

ompi/mca/coll/acoll/coll_acoll_allreduce.c

+            volatile int tmp1 = __atomic_load_n(
+                (int *) ((char *) data->allshmmmap_sbuf[group[0]] + offset + CACHE_LINE_SIZE * group[i]),
+                __ATOMIC_RELAXED);
+            while (tmp1 == val) {
+                tmp1 = __atomic_load_n((int *) ((char *) data->allshmmmap_sbuf[group[0]] + offset
+                                                + CACHE_LINE_SIZE * group[i]),
+                                       __ATOMIC_RELAXED);
+            }


No need for volatile (I believe) and maybe we can use the opal_atomic API instead?

We are planning to refactor some of the code in the next iteration, will keep your comment in mind. Just curious, what would be the benefit of opal_atomic?

opal_atomic selects whatever atomic API is available. Strictly speaking, __atomic* is a GCC extension (that is meant to resemble the C11 standard _Atomic API) and I'm worried that we hit a compiler that doesn't support the __atomic API.

@devreal AFAIK we don't have opal_atomic_load/opal_atomic_store right? (related: #9722). We should at some point add them though :-), xhc will also use them.

devreal · 2024-07-17T21:39:53Z

ompi/mca/coll/acoll/coll_acoll_utils.h

+    const int leader_shm_size = 16 * 1024; 
+    const int cache_line_size = 64;
+    const int per_rank_shm_size = 8 * 1024;


Thanks! Are those numbers used anywhere else? I tried to find similar values. I'm a bit concerned that changing the values here would break code elsewhere. Maybe they should be #defined in this header and used wherever the sizes of the buffers are relevant?

Good point, done.

The numbers are primarily used within *utils.h, but as you mentioned, it could be used elsewhere as well.

acoll is a collective component optimized for AMD "Zen"-based processors. It supports Bcast, Allreduce, Reduce, Barrier, Gather and Allgather APIs. Signed-off-by: Nithya V S <[email protected]>

devreal

I'm OK with merging this but I hope we get the replace of __atomic with opal_atomic soon.

github-actions bot added the Target: main label Apr 22, 2024

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Add acoll collective component

8ccb15c

acoll is a collective component optimized for AMD "Zen"-based processors. It supports Bcast, Allreduce, Reduce, Barrier, Gather and Allgather APIs. Signed-off-by: Nithya V S <[email protected]>

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Merge branch 'main' into main

771ac61

edgargabriel merged commit 9bc1487 into open-mpi:main Jul 19, 2024
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		@@ -0,0 +1,15 @@
		Copyright (c) 2023-2024 Advanced Micro Devices, Inc. All rights

		@@ -0,0 +1,11 @@
		Copyright (C) 2024, Advanced Micro Devices, Inc. All rights reserved.

Add the acoll component #12484

Add the acoll component #12484

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amd-nithyavs commented Apr 22, 2024

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mshanthagit commented May 21, 2024

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mshanthagit commented Jun 4, 2024

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amd-nithyavs commented Jul 16, 2024

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edgargabriel commented Apr 22, 2024 •

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mshanthagit Apr 29, 2024 •

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gkatev Jul 19, 2024 •

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