UCP/EP: Cleanup proto reqs on failure #5821

dmitrygx · 2020-10-21T12:30:18Z

What

Clean up proto reqs on failure

Why ?

To fix UCP request leak when they are not UCT-managed (i.e. not send in-progress or not in pending)

How ?

Use UCP EP extension to save submitted UCP requests (only TAG sync send and TAG/AM RNDV) to hlist
Purge them from hlist when UCP EP failed

dmitrygx · 2020-11-12T20:58:16Z

@brminich @hoopoepg @evgeny-leksikov could you review pls?

evgeny-leksikov · 2020-11-13T06:12:51Z

src/ucp/core/ucp_ep.c

+            /* it means that purging started from a request responsible
+             * for sending RTR, so a request responsible for copying
+             * data from staging buffer is a receive request */
+            req->super_req->recv.remaining -= req->recv.length;
+        } else {
+            /* it means that purging started from a request responsible
+             * for sending RTR, so a request responsible for copying
+             * data from staging buffer is a send request */


pls unite to single comment just pointing to difference.

evgeny-leksikov · 2020-11-13T06:19:45Z

src/ucp/core/ucp_request.inl

@@ -50,17 +50,17 @@


 /* defined as a macro to print the call site */
-#define ucp_request_get(_worker) \
-    ({ \
+static inline ucp_request_t* ucp_request_get(ucp_worker_h _worker) \


USC_F_ALWAYS_INLINE

pls remove ending \s, no need in func

and move function below defines

also func names do not start with _

it is leftover from debugging
rolled back to the previous state

evgeny-leksikov · 2020-11-13T06:21:35Z

src/ucp/rma/flush.c

+                ucs_hlist_add_tail(&flush_state->reqs,
+                                   &req->list_elem);
+                ucs_trace_req("added flush request %p to ep remote completion "
+                              " queueu with sn %d",


typo queueu and extra space

evgeny-leksikov · 2020-11-13T06:26:00Z

src/ucp/rndv/rndv.c

+                                        ucp_rndv_rtr_pack,
+                                        sizeof(ucp_rndv_rtr_hdr_t) +
+                                        packed_rkey_size);
+    if ((status != UCS_OK) && (status != UCS_ERR_NO_RESOURCE)) {


ucs_unlikely

evgeny-leksikov · 2020-11-13T06:32:11Z

src/ucp/rndv/rndv.c

@@ -821,6 +802,10 @@ ucp_rndv_recv_frag_put_mem_type(ucp_request_t *rreq, ucp_request_t *rndv_req,
                                      ucp_ep_use_indirect_id(freq->send.ep));
    }

+    ucs_assert(freq->send.ep != NULL);
+    ucs_hlist_add_tail(&ucp_ep_ext_gen(freq->send.ep)->proto_reqs,


why do we need to save fragments on the list for put? should not transport report failure? otherwise the request should stay on pending, rigth?

this is PUT operation from HOST staging buffer to GPU device buffer after receiving ATP from a peer on each fragment or after successful GET operation in pipelined RNDV
yes, we don't need this, since it is a local operation

removed

evgeny-leksikov · 2020-11-13T06:38:01Z

test/gtest/common/test_obj_size.cc

@@ -48,7 +48,7 @@ UCS_TEST_F(test_obj_size, size) {
 #else
    EXPECTED_SIZE(ucp_ep_t, 64);
    /* TODO reduce request size to 240 or less after removing old protocols state */
-    EXPECTED_SIZE(ucp_request_t, 296);
+    EXPECTED_SIZE(ucp_request_t, 312);


no way to avoid this?

I did two PRs to decrease UCP request size from 320 bytes to 296 bytes: #5829 and #5825
I have the privilege to use at least 16 bytes :)
unfortunately, no way to reduce this - I tried to refactor UCP request send part, but it has ucp_wireup_msg_t in the union that could be reduced and it is our limit...

hoopoepg · 2020-11-13T07:42:00Z

src/ucp/core/ucp_request.inl

@@ -50,17 +50,17 @@


 /* defined as a macro to print the call site */
-#define ucp_request_get(_worker) \
-    ({ \
+static inline ucp_request_t* ucp_request_get(ucp_worker_h _worker) \


and move function below defines

hoopoepg · 2020-11-13T07:42:39Z

src/ucp/core/ucp_worker.c

 #include "ucp_worker.h"
+#include "ucp_am.h"


why it moved?

hoopoepg · 2020-11-13T07:43:50Z

src/ucp/rma/flush.c

+                ucs_trace_req("added flush request %p to ep remote completion "
+                              " queueu with sn %d",


there are 2 spaces in target string completion++queueU

brminich

Can you please add some tests to make sure the functionality is covered?

brminich · 2020-11-13T10:47:47Z

src/ucp/core/ucp_ep.c

+static void ucp_ep_req_purge(ucp_request_t *req, ucs_status_t status,
+                             int recursive)
+{
+    if (req->flags & (UCP_REQUEST_FLAG_SEND_AM |


minor: seems to fit to 80 syms
(same below)

done
but it doesn't fit 80 syms below

brminich · 2020-11-13T10:55:29Z

src/ucp/rndv/rndv.c

+    /* don't release rndv request in case of success, since it was sent to
+     * a peer as a remote request ID, and we will use the req to track an
+     * user-exposed receive request (and request for copying data from staging
+     * buffer in case of fragmented RNDV) */


minor: maybe use pipelined instead of fragmented to avoid confusion with multirail?

brminich · 2020-11-13T11:16:06Z

src/ucp/rndv/rndv.c

@@ -1297,6 +1282,16 @@ UCS_PROFILE_FUNC(ucs_status_t, ucp_rndv_rts_handler,
    }
 }

+static void ucp_rndv_ats_complete(ucp_request_t *sreq, ucs_status_t status)


no need for separate func, which is called just once

brminich · 2020-11-13T11:18:53Z

src/ucp/core/ucp_request.inl

@@ -50,17 +50,17 @@


 /* defined as a macro to print the call site */
-#define ucp_request_get(_worker) \
-    ({ \
+static inline ucp_request_t* ucp_request_get(ucp_worker_h _worker) \


also func names do not start with _

src/ucp/core/ucp_request.inl

src/ucp/core/ucp_ep.c

src/ucp/rndv/rndv.c

src/ucp/core/ucp_ep.c

src/ucp/rndv/rndv.inl

src/ucp/core/ucp_request.inl

src/ucp/rndv/rndv.inl

src/ucp/core/ucp_request.inl

src/ucp/rndv/rndv.inl

src/ucp/core/ucp_request.inl

src/ucp/rndv/rndv.c

dmitrygx · 2020-11-17T05:54:08Z

bot:pipe:retest

dmitrygx · 2020-11-17T09:11:07Z

@evgeny-leksikov @hoopoepg @brminich is it ok now?

dmitrygx · 2020-11-18T19:47:54Z

/azp run

azure-pipelines · 2020-11-18T19:48:12Z

Azure Pipelines successfully started running 1 pipeline(s).

dmitrygx · 2020-11-18T19:48:18Z

failure is #5840

dmitrygx · 2021-03-25T04:42:34Z

@hoopoepg @brminich could you review pls?

src/ucp/core/ucp_ep.c

yosefe · 2021-03-25T12:44:12Z

src/ucp/core/ucp_ep.c

+    if (req->id != UCP_REQUEST_ID_INVALID) {
+        ucp_request_id_release(req);
+    }


is it possible some of the protocols cleanup flow would try to release the request it?

nice catch, Yossi
currently, we don't have such protocols, but they could be implemented in the future
fixed this comment by moving checking/releasing of request ID at the end of the function, but need to implement some hack (save and remove RELEASE flag before calling request complete procedure)

maybe "extract" the id from the request to a local variable?

then protocols which expect that request ID is valid will fail ucp_request_id_release()

decided to not do it for now

src/ucp/core/ucp_ep.c

yosefe · 2021-03-25T12:48:10Z

src/ucp/core/ucp_ep.c

+    if ((wireup_ep != NULL) && ucp_wireup_ep_test(wireup_ep)) {
+        /* flush state is not valid yet */
+        return;
+    }


can we check some ep flags instead? a more "direct" check if flush state is valid or not?

src/ucp/core/ucp_request.inl

src/ucp/rndv/rndv.c

test/gtest/ucp/test_ucp_sockaddr.cc

yosefe · 2021-03-25T19:59:56Z

src/ucp/core/ucp_request.inl

@@ -839,8 +847,11 @@ ucp_request_id_release(ucp_request_t *req)
    ucp_request_id_reset(req);

    ucs_assert(req->send.ep != NULL);
-    ucs_hlist_del(&ucp_ep_ext_gen(req->send.ep)->proto_reqs,
-                  &req->send.list_elem);
+    if (ucs_unlikely(ucp_ep_config(req->send.ep)->key.err_mode ==


can we unite it with the "if" inside ucs_ptr_map_del() which checks for direct/indirect id? to avoid extra branch on fast path?

but user can set UCX_PROTO_INDIRECT_ID=n in case of error handling too and vice versa (UCX_PROTO_INDIRECT_ID=y in case of non-error handling)

yes, i see the problem, need to discuss this offline
for now, i would add comment ion the code that we should optimize this
BTW it happens only for eager/sync, rndv, and sw-rma flow, right?

for now, i would add comment ion the code that we should optimize this

added the comment

BTW it happens only for eager/sync, rndv, and sw-rma flow, right?

yes, it is right

yosefe · 2021-03-25T20:02:04Z

src/ucp/core/ucp_ep.c

+    /* Mark release to be not released from the ucp_request_complete() procedure
+     * to be able do some actions with this request (e.g. check and release
+     * request ID) after completing an operation.


i think it's better to release the request id for each protocol explicitly. after we find which protocol is it according to req flags, we can decide whether need to release the id or not. and potentially unite code with normal-flow completion and id release.

do you mean to release ID from protocol completion callback?
but it is not possible sometimes, because some of them, e.g. RNDV PUT rely on the fact that request ID will be released upon receiving RTR packet, since ID is no longer needed

I mean from the if/else/else ... code below
is it possible some protocols release the id inside the completion callback?

is it possible some protocols release the id inside the completion callback?

no, currently we don't have such protocols.
but the existing protocols (or new ones) can be updated to release the ID inside its completion callback

src/ucp/core/ucp_ep.c

src/ucp/rndv/rndv.c

yosefe · 2021-03-29T13:29:23Z

error seems relevant:

2021-03-29T12:10:16.1473466Z -------------------------------------------------------
2021-03-29T12:10:16.1474321Z  T E S T S
2021-03-29T12:10:16.1475403Z -------------------------------------------------------
2021-03-29T12:10:16.8047278Z Running org.openucx.jucx.UcpMemoryTest
2021-03-29T12:10:17.6701981Z [swx-rdmz-ucx-gpu-02:18494:0:18514]    ucp_ep.inl:147  Assertion `ep->flags & UCP_EP_FLAG_FLUSH_STATE_VALID' failed
2021-03-29T12:10:17.6875275Z /scrap/azure/agent-08/AZP_WORKSPACE/1/s/src/ucp/core/ucp_ep.inl: [ ucp_ep_flush_state() ]
2021-03-29T12:10:17.6877076Z       ...
2021-03-29T12:10:17.6877838Z       144 
2021-03-29T12:10:17.6878777Z       145 static UCS_F_ALWAYS_INLINE ucp_ep_flush_state_t* ucp_ep_flush_state(ucp_ep_h ep)
2021-03-29T12:10:17.6879718Z       146 {
2021-03-29T12:10:17.6881071Z ==>   147     ucs_assert(ep->flags & UCP_EP_FLAG_FLUSH_STATE_VALID);
2021-03-29T12:10:17.6882431Z       148     ucs_assert(!(ep->flags & UCP_EP_FLAG_ON_MATCH_CTX));
2021-03-29T12:10:17.6883770Z       149     ucs_assert(!(ep->flags & UCP_EP_FLAG_CLOSE_REQ_VALID));
2021-03-29T12:10:17.6885046Z       150     return &ucp_ep_ext_gen(ep)->flush_state;
2021-03-29T12:10:17.7043666Z ==== backtrace (tid:  18514) ====
2021-03-29T12:10:17.7046765Z  0 0x000000000003338e ucp_ep_flush_state()  /scrap/azure/agent-08/AZP_WORKSPACE/1/s/src/ucp/core/ucp_ep.inl:147
2021-03-29T12:10:17.7048525Z  1 0x000000000003338e ucp_ep_reqs_purge()  /scrap/azure/agent-08/AZP_WORKSPACE/1/s/src/ucp/core/ucp_ep.c:2734
2021-03-29T12:10:17.7050164Z  2 0x000000000003384c ucp_ep_destroy_base()  /scrap/azure/agent-08/AZP_WORKSPACE/1/s/src/ucp/core/ucp_ep.c:263
2021-03-29T12:10:17.7051683Z  3 0x000000000003384c ucp_ep_remove_ref()  /scrap/azure/agent-08/AZP_WORKSPACE/1/s/src/ucp/core/ucp_ep.c:281
2021-03-29T12:10:17.7053139Z  4 0x000000000003410a ucp_worker_destroy_mem_type_endpoints()  /scrap/azure/agent-08/AZP_WORKSPACE/1/s/src/ucp/core/ucp_ep.c:477
2021-03-29T12:10:17.7054582Z  5 0x000000000004713e ucp_worker_destroy()  /scrap/azure/agent-08/AZP_WORKSPACE/1/s/src/ucp/core/ucp_worker.c:2372
2021-03-29T12:10:17.7056324Z  6 0x000000000004713e ucp_worker_close_cms()  /scrap/azure/agent-08/AZP_WORKSPACE/1/s/src/ucp/core/ucp_worker.c:1393
2021-03-29T12:10:17.7057735Z  7 0x000000000004713e ucp_worker_destroy()  /scrap/azure/agent-08/AZP_WORKSPACE/1/s/src/ucp/core/ucp_worker.c:2373
2021-03-29T12:10:17.7058604Z =================================
2021-03-29T12:10:17.7059760Z [swx-rdmz-ucx-gpu-02:18494:0:18514] Process frozen...
2021-03-29T13:02:59.2572990Z ##[error]The operation was canceled.

dmitrygx

error seems relevant:

yes, need to fix flush_state

dmitrygx · 2021-03-25T21:11:44Z

src/ucp/core/ucp_ep.c

+    if ((wireup_ep != NULL) && ucp_wireup_ep_test(wireup_ep)) {
+        /* flush state is not valid yet */
+        return;
+    }


removed - I found that it isn't needed anymore

dmitrygx · 2021-03-25T21:21:29Z

src/ucp/rndv/rndv.c

@@ -846,7 +851,7 @@ UCS_PROFILE_FUNC_VOID(ucp_rndv_recv_frag_put_completion, (self),
                rreq->recv.remaining, freq->send.length);
    rreq->recv.remaining -= freq->send.length;
    if (rreq->recv.remaining == 0) {
-        ucp_rndv_recv_req_complete(rreq, UCS_OK);
+        ucp_request_complete_and_dereg_recv_rndv(rreq, UCS_OK);


dmitrygx · 2021-03-29T10:19:36Z

src/ucp/core/ucp_request.inl

@@ -839,8 +847,11 @@ ucp_request_id_release(ucp_request_t *req)
    ucp_request_id_reset(req);

    ucs_assert(req->send.ep != NULL);
-    ucs_hlist_del(&ucp_ep_ext_gen(req->send.ep)->proto_reqs,
-                  &req->send.list_elem);
+    if (ucs_unlikely(ucp_ep_config(req->send.ep)->key.err_mode ==


for now, i would add comment ion the code that we should optimize this

added the comment

BTW it happens only for eager/sync, rndv, and sw-rma flow, right?

yes, it is right

dmitrygx · 2021-03-29T10:20:32Z

src/ucp/core/ucp_ep.c

+    /* Mark release to be not released from the ucp_request_complete() procedure
+     * to be able do some actions with this request (e.g. check and release
+     * request ID) after completing an operation.


is it possible some protocols release the id inside the completion callback?

no, currently we don't have such protocols.
but the existing protocols (or new ones) can be updated to release the ID inside its completion callback

dmitrygx · 2021-03-29T11:47:52Z

src/ucp/core/ucp_ep.c

+    if (req->id != UCP_REQUEST_ID_INVALID) {
+        ucp_request_id_release(req);
+    }


decided to not do it for now

src/ucp/core/ucp_ep.c

yosefe · 2021-03-30T09:23:08Z

src/ucp/wireup/ep_match.c

+     * flush state won't be used (flush state is considered as valid, when
+     * EP doesn't exist on matchong context and remoe EP ID is set) */
+    ucp_ep_update_flags(ep, 0,
+                        UCP_EP_FLAG_ON_MATCH_CTX | UCP_EP_FLAG_REMOTE_ID);


why do we set remote id here?

we release the flag here instead to not use flush state

yosefe · 2021-03-30T09:25:18Z

src/ucp/wireup/wireup.c

        } else {
+            ucp_ep_update_remote_id(ep, msg->src_ep_id);


why needed?

now, returned back - but changed other places
we rely on the fact that if REMOTE_ID is set then FLUSH state is valid
so, changed it to check FLUSH_STATE/ON_MACTCH_CTX flags when updating remote ID

yosefe · 2021-03-30T09:26:34Z

src/ucp/core/ucp_ep.inl

@@ -232,6 +232,7 @@ static inline void ucp_ep_flush_state_reset(ucp_ep_h ep)
               ((flush_state->send_sn == 0) &&
                (flush_state->cmpl_sn == 0) &&
                ucs_hlist_is_empty(&flush_state->reqs)));
+    ucs_assert(ep->flags & UCP_EP_FLAG_REMOTE_ID);


why need this assertion?

just to make sure the we reset flush state after updating a remote ID
so, we can rely on the flag

I think better to make updating remote ID dependant on flush state or matching context flags - done it

i think better not introduce such dependency in this PR, since it can require more substantial refactoring

i think better not introduce such dependency in this PR, since it can require more substantial refactoring

I have already done it :)
just need to change the sequence

dmitrygx · 2021-03-30T18:29:57Z

@yosefe @brminich could you review pls? your comments were fixed

dmitrygx · 2021-03-30T18:30:42Z

failure is #6568

src/ucp/core/ucp_ep.c

src/ucp/core/ucp_request.inl

src/ucp/rndv/rndv.c

src/ucp/core/ucp_request.inl

src/ucp/core/ucp_ep.c

src/ucp/core/ucp_request.inl

dmitrygx force-pushed the topic/ucp/req_proto_err_handling branch from 5a5a837 to 6565d36 Compare October 21, 2020 17:34

This was referenced Oct 22, 2020

UCP/CORE: Reduce UCP request size #5825

Merged

UCP/CORE: Reduce UCP request size (new approach) #5829

Merged

yosefe mentioned this pull request Oct 25, 2020

UCP/EP: clean up proto reqs on failure #5666

Closed

dmitrygx changed the title ~~UCP/EP: Clean up proto reqs (send only) on failure~~ UCP/EP: Clean up proto reqs on failure Oct 27, 2020

dmitrygx force-pushed the topic/ucp/req_proto_err_handling branch from 1875428 to f09147b Compare October 27, 2020 14:52

dmitrygx changed the title ~~UCP/EP: Clean up proto reqs on failure~~ UCP/EP: Cleanup proto reqs on failure Oct 27, 2020

dmitrygx force-pushed the topic/ucp/req_proto_err_handling branch 3 times, most recently from 69d47f5 to 592b80a Compare October 27, 2020 21:17

dmitrygx mentioned this pull request Oct 28, 2020

UCP/CORE: Reduce size of generic EP extension for further usage #5848

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yosefe merged commit 0477cce into openucx:master Mar 31, 2021

		ucs_trace_req("added flush request %p to ep remote completion "
		" queueu with sn %d",

UCP/EP: Cleanup proto reqs on failure #5821

UCP/EP: Cleanup proto reqs on failure #5821

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dmitrygx commented Oct 21, 2020 • edited Loading

What

Why ?

How ?

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dmitrygx commented Nov 17, 2020

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yosefe commented Mar 29, 2021

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