UCP/API: Support endpoint performance evaluation #6403

gleon99 · 2021-02-25T12:04:48Z

What

Support querying performance of an endpoint, by message length and operation type.
At the first stage, a constant bandwidth is returned, regardless of the given params.
In the future, more precise bandwidth calculation will be implemented.

Why ?

Allow users to retrieve bandwidth information per-endpoint.

gleon99 · 2021-02-25T12:05:30Z

src/ucp/api/ucp.h

+ * 
+ * This enumeration defines all available UCP operations.
+ */
+typedef enum ucp_ep_op {


Maybe using ucp_feature would be appropriate here, instead of creating a new enum? Unsure about that..

let's use ucp_ep_operation_t

Are you sure?
My logic was to be consistent with types like ucp_op_attr_t, ucp_atomic_fetch_op_t, etc. - which use _op_ and not _operation_.

@gleon99 maybe rename to ucp_ep_op_type_t
UCP_OP_TYPE_TAG
and
ucp_ep_op_type_t op_type in the struct?

because TAG is {tag_send,tag_send_sync}; RMA is {put,get} - each value is >1 specific op

yosefe · 2021-02-28T11:10:40Z

src/ucp/api/ucp.h

+ * This enumeration defines all available UCP operations.
+ */
+typedef enum ucp_ep_op {
+    UCP_OP_TAG,   /**< Tag matching */


UCP_OPERATION_TAG

yosefe · 2021-02-28T11:10:48Z

src/ucp/api/ucp.h

+    UCP_OP_AMO32, /**< 32-bit atomic operations */
+    UCP_OP_AMO64  /**< 64-bit atomic operations */


UCP_OPERATION_ATOMIC

yosefe · 2021-02-28T11:11:09Z

src/ucp/api/ucp.h

+ */
+enum ucp_ep_perf_attr_field {
+    /** Enables @ref ucp_ep_perf_attr_t::message_size */
+    UCP_EP_ATTR_FIELD_MESSAGE_SIZE       = UCS_BIT(0),


UCP_EP_PERF_ATTR_FIELD_MESSAGE_SIZE

yosefe · 2021-02-28T11:11:23Z

src/ucp/api/ucp.h

+
+    /** Enables @ref ucp_ep_perf_attr_t::bandwidth */
+    UCP_EP_ATTR_FIELD_BANDWIDTH          = UCS_BIT(4)
+};


ucp_ep_perf_attr_field_t

yosefe · 2021-02-28T11:11:48Z

src/ucp/api/ucp.h

+ * 
+ * This enumeration defines all available UCP operations.
+ */
+typedef enum ucp_ep_op {


let's use ucp_ep_operation_t

yosefe · 2021-02-28T11:12:54Z

src/ucp/api/ucp.h

+    /**
+     * Bandwidth this endpoint is able to provide.
+     * This field is set by the UCP layer.
+     */
+    double            bandwidth;


instead of bandwidth: we can provide estimated to deliver the message
this will encompass both bw and latency
user can calc size/time to get bw

Do you mean a time estimate (i.e bw / size) ?

gleon99 · 2021-03-02T14:55:46Z

@yosefe , fixed CR comments.

yosefe · 2021-03-03T09:44:41Z

src/ucp/api/ucp.h

+    uct_ep_op_t       operation;
+
+    /**
+     * Estimated time required to send a message of a given size on this endpoint.


pls add time is in seconds

yosefe · 2021-03-03T09:45:16Z

src/ucp/core/ucp_ep.c

+        iface_attr = ucp_worker_iface_get_attr(worker, max_bandwidth_rsc_index);
+        attr->estimated_time = ucp_tl_iface_latency(context,
+                                                    &iface_attr->latency) +
+                               attr->message_size / max_bandwidth;


pls beautify (use local var, indent, etc)

Added local vars.

yosefe · 2021-03-03T09:45:55Z

src/ucp/core/ucp_ep.c

+            rsc_index       = key->lanes[lane].rsc_index;
+            wiface          = worker->ifaces[rsc_index];
+            bandwidth       = ucp_tl_iface_bandwidth(context,
+                                                     &wiface->attr.bandwidth);


weird indent

Why? The indent is on the first char after the (.

i mean, too many spaces before =

yosefe · 2021-03-03T09:46:22Z

test/gtest/ucp/test_ucp_ep.cc

+    attr.message_size = 1000;
+    result            = ucp_ep_perf_query(ep, &attr);
+    EXPECT_EQ(result, UCS_OK);
+    EXPECT_GT(attr.estimated_time, 0);


EXPECT_LT(attr.estimated_time, 30);

brminich · 2021-03-03T13:44:38Z

src/ucp/api/ucp.h

+    UCP_OP_RMA,   /**< Remote memory access */
+    UCP_OP_AMO32, /**< 32-bit atomic operations */
+    UCP_OP_AMO64  /**< 64-bit atomic operations */
+} uct_ep_op_t;


STREAM is missing here

brminich · 2021-03-03T13:46:38Z

src/ucp/api/ucp.h

+ *
+ * @return Error code as defined by @ref ucs_status_t
+ */
+ucs_status_t ucp_ep_perf_query(ucp_ep_h ep, ucp_ep_perf_attr_t *attr);


maybe use ucp_ep_query name to be able to extend this in the future? Otherwise we will have to introduce new call if want to query non-perf attrs

I agree. we already made some plans to query an ep for the client-server case to retrieve an ep's local connected sockaddr and the remote sockaddr it's connected to.
if we dont use ucp_ep_query now, we would need to have different functions to querying different ep attrs.

There is a difference between ucp_ep_query and ucp_ep_perf_query: in perf_query, the user would pass input parameters (memory types, length, operation) for which the performance should be retrieved.
IMO it would be weird to mix those input parameters along with general ep query, and better have 2 separate functions.

then maybe avoid using 'query' in the name here?
you dont think it can be confusing for a user to have 2 ucp ep API querying functions? ucp_ep_query and ucp_ep_perf_query

the user would pass input parameters (memory types, length, operation) for which the performance should be retrieved.

maybe use struct to combine them?

maybe use struct to combine them?

That struct will also need to have field mask

then maybe avoid using 'query' in the name here?

agree it would be better, unfortunately I can't thing of a good name, maybe something like ucp_ep_estimate_perf or ucp_ep_eval_perf ?

ucp_ep_calc_perf?
ucp_ep_eval_perf sounds good to me.

@gleon99 WDYT about ucp_ep_eval_perf?
i think we should sync the UCT API with same name as we decide here

Sounds good. Maybe ucp_ep_estimate_perf? "estimation" is perhaps more accurate here, as the function estimates performance and returns an estimate, rather than evaluating it. But I'm ok with _eval_ as well.

ok, let's use estimate

@yosefe let's discuss offline. This does look like a query interface and I'm still not sure why want separate perf API. I do think it is the right functionality to have we just need to flush out the API

brminich · 2021-03-03T13:47:07Z

src/ucp/core/ucp_ep.c

+    ucp_rsc_index_t rsc_index = 0, max_bandwidth_rsc_index = 0;
+    double bandwidth = 0, max_bandwidth = 0;


plz moved initialized vars to the very beginning of the func

brminich · 2021-03-03T13:48:37Z

src/ucp/api/ucp.h

+    uint64_t          field_mask;
+
+    /**
+     * Message size to use for determining performance.
+     * This field must be initialized by the caller.
+     */
+    size_t            message_size;
+
+    /**
+     * Local memory type to use for determining performance.
+     * This field must be initialized by the caller.
+     */
+    ucs_memory_type_t local_memory_type;
+
+    /**
+     * Remote memory type to use for determining performance.
+     * Relevant only for operations that have remote memory access.
+     * This field must be initialized by the caller.
+     */
+    ucs_memory_type_t remote_memory_type;
+
+    /**
+     * Operation to report performance for.
+     * This field must be initialized by the caller.
+     */
+    uct_ep_op_t       operation;


what is required to be set to get estimated_time? Can i omit some or all input params? What would UCX use then?

At the first phase (current implementation), only message_size is used for time calculation. {local,remote}_message_size and operation are here just for future compatibility, but actually they can be safely removed here and added back in a later commit, when their values would really be used.

@yosefe - shall I explicitly mention that in code comments, or remove these vars at all?

i think defaults are worth mentioning for the optional fields

Since this is in/out structure, it is really challenging to figure out what is input and what is output.

Since this is extendable, I would suggest to remove what is not going to be implemented in a near term (before next release) and we will add as it is gets implemented. This way it also aligns better with your gtest, which tests only the message size.

so this means - keep only message size (input) and time (output) for now

yosefe · 2021-03-05T11:46:51Z

src/ucp/api/ucp.h

@@ -368,7 +368,8 @@ typedef enum ucp_ep_op {
    UCP_OP_AM,    /**< Active messge */
    UCP_OP_RMA,   /**< Remote memory access */
    UCP_OP_AMO32, /**< 32-bit atomic operations */
-    UCP_OP_AMO64  /**< 64-bit atomic operations */
+    UCP_OP_AMO64, /**< 64-bit atomic operations */


we should have only ATOMIC, not AMO32/64
since there is a "size" field

yosefe · 2021-03-05T11:47:34Z

src/ucp/core/ucp_ep.c

    ucp_lane_index_t lane;
    ucp_worker_iface_t *wiface;
    uct_iface_attr_t *iface_attr;
-    ucp_rsc_index_t rsc_index = 0, max_bandwidth_rsc_index = 0;
-    double bandwidth = 0, max_bandwidth = 0;
+    double constant_estimated_time, variable_estimated_time;


maybe can use ucs_linear_func_t

yosefe · 2021-03-05T11:48:03Z

src/ucp/core/ucp_ep.c

+    double bandwidth = 0, max_bandwidth = 0;
+    ucp_rsc_index_t rsc_index = 0, max_bandwidth_rsc_index = 0;


do we really need to initialize all of these?

gleon99 · 2021-03-07T14:09:39Z

bot:pipe:retest

shamisp · 2021-03-07T15:38:16Z

src/ucp/api/ucp.h

+ *
+ * @return Error code as defined by @ref ucs_status_t
+ */
+ucs_status_t ucp_ep_estimate_perf(ucp_ep_h ep, ucp_ep_perf_attr_t *attr);


Why limit the query just for performance ?

@shamisp pls see #6403 (comment)

perf offline discussion with @shamisp, suggest to rename this API to ucp_ep_assess_perf.
@tonycurtis WDYT?

My first thought was "eval" might be better, and that's already been suggested.

(The comment needs updating too if that's not a W.I.P. and you could put "estimate" there if you think it would be helpful)

@shamisp are you ok with ucp_ep_evaluate_perf?

@gleon99 can you pls rename (and docs, if needed) to ucp_ep_evaluate_perf?

@yosefe , done

gleon99 · 2021-03-10T13:49:47Z

@yosefe , is this one still blocked?

yosefe · 2021-03-10T13:56:02Z

@shamisp can you pls take a look?

yosefe

why added test/gtest/ucp/test_ucp_worker_query.cc ?

yosefe · 2021-03-18T08:27:04Z

src/ucp/api/ucp.h

+ * 
+ * This enumeration defines all available UCP operations.
+ */
+typedef enum ucp_ep_op {


@gleon99 maybe rename to ucp_ep_op_type_t
UCP_OP_TYPE_TAG
and
ucp_ep_op_type_t op_type in the struct?

because TAG is {tag_send,tag_send_sync}; RMA is {put,get} - each value is >1 specific op

src/ucp/api/ucp.h

test/gtest/ucp/test_ucp_ep.cc

yosefe · 2021-03-19T10:29:06Z

bot:pipe:retest

yosefe · 2021-03-25T12:53:27Z

@shamisp @tonycurtis can you pls take a look?

tonycurtis · 2021-03-25T13:28:18Z

src/ucp/api/ucp.h

+ * @ingroup UCP_ENDPOINT
+ * @brief UCP performance endpoint attributes.
+ *
+ * The structure defines the attributes which characterize


which -> that

shamisp · 2021-03-25T15:34:04Z

src/ucp/api/ucp.h

+    UCP_OP_TYPE_RMA,    /**< Remote memory access */
+    UCP_OP_TYPE_ATOMIC, /**< Atomic operations */
+    UCP_OP_TYPE_STREAM  /**< Stream */
+} ucp_ep_op_type_t;


Almost identical to

ucx/src/ucp/api/ucp.h

Line 140 in b72fec8

enum ucp_feature {

it's not exactly the same, and unfortunately we can't change UCP_FEATURE_xx, but on other hand it would not exactly fit perf query API

shamisp · 2021-03-25T15:37:07Z

src/ucp/api/ucp.h

+     * on this endpoint.
+     * This field is set by the @ref ucp_ep_evaluate_perf function.
+     */
+    double            estimated_time;


@yosefe maybe we should separate in and out arg ? this looks a bit odd. There is also enable mask for this field. What happens if the enable bit is not set but the function is called ?

What happens if the enable bit is not set but the function is called?

Then this field will not be written to by the function

shamisp · 2021-03-25T15:51:53Z

And if we add another [in] field we will have in/out fields interleaving each other.

…

On Thu, Mar 25, 2021 at 10:40 AM Yossi Itigin ***@***.***> wrote: ***@***.**** commented on this pull request. ------------------------------ In src/ucp/api/ucp.h <#6403 (comment)>: > + * This field must be initialized by the caller. + */ + ucs_memory_type_t remote_memory_type; + + /** + * Operation type to report performance for. + * This field must be initialized by the caller. + */ + ucp_ep_op_type_t op_type; + + /** + * Estimated time (in seconds) required to send a message of a given size + * on this endpoint. + * This field is set by the @ref ucp_ep_evaluate_perf function. + */ + double estimated_time; What happens if the enable bit is not set but the function is called? Then this field will not be written to by the function — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#6403 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AARB5WCBTMTTLPZYEDR776TTFNKOHANCNFSM4YGMDDRA> .

yosefe · 2021-03-25T19:52:17Z

And if we add another [in] field we will have in/out fields interleaving each other.

It's possible, but IMO this is not a significant issue, but on the other hand - adding another structure and bitfield will add more "API burden". We are documenting for each field whether it's "in" or "out".

@tonycurtis which one do you think is better from user perspective: separate "in" and "out" structures with separate bitmasks, or put all in/out params in same struct?

gleon99 · 2021-04-13T13:26:41Z

@tonycurtis , @shamisp - can comment please?

tonycurtis · 2021-04-13T13:33:54Z

For clarity's sake, a const parameter with the request, and another parameter with the result does seem less potentially confusing.

gleon99 · 2021-05-03T11:34:28Z

@yosefe - fixed according to @tonycurtis comment. Notice that I separated the args of ucp_ep_evaluate_perf to const ucp_ep_evaluate_perf_request_t *request, ucp_ep_evaluate_perf_result_t *result.

yosefe · 2021-05-04T13:33:16Z

src/ucp/api/ucp.h

-typedef enum ucp_ep_perf_attr_field {
-    /** Enables @ref ucp_ep_perf_attr_t::message_size */
-    UCP_EP_PERF_ATTR_FIELD_MESSAGE_SIZE       = UCS_BIT(0),
+typedef enum ucp_ep_perf_request_field {


for consistency, it should be
ucp_ep_perf_param_field - for input
ucp_ep_perf_attr_field - for output

gleon99 · 2021-05-05T09:26:16Z

@yosefe , fixed request,result -> param,attr everywhere.

gleon99 · 2021-05-05T10:16:50Z

@yosefe - squashed.

yosefe · 2021-05-06T08:27:41Z

@tonycurtis @shamisp can you check again the latest version?

tonycurtis · 2021-05-06T12:11:33Z

src/ucp/api/ucp.h

+ */
+typedef enum {
+    UCP_OP_TYPE_TAG,    /**< Tag matching */
+    UCP_OP_TYPE_AM,     /**< Active messge */


shamisp · 2021-05-06T13:45:41Z

src/ucp/api/ucp.h

+     * Local memory type to use for determining performance.
+     * This field must be initialized by the caller.
+     */
+    ucs_memory_type_t local_memory_type;


the field is not user by the implementation and not tested by unit test. Why we introduce it now ?

We want to allow applications to pass more information to UCP, so future implementations of the UCX library will be able to make a more accurate performance estimation. IMO it is better than requiring application developers to keep updating their codes and pass additional parameters.

But we are ignoring this parameter and don't test it..I don't see why would anybody use it.

do you think it would be better to remove this from API until it's really implemented?

If we don't implement it and test it, it makes more sense to remove it. It can be easy added later on.

shamisp · 2021-05-06T13:45:45Z

src/ucp/api/ucp.h

+     * Relevant only for operations that have remote memory access.
+     * This field must be initialized by the caller.
+     */
+    ucs_memory_type_t remote_memory_type;


the field is not user by the implementation and not tested by unit test. Why we introduce it now ?

shamisp · 2021-05-06T13:46:08Z

src/ucp/api/ucp.h

+     * Message size to use for determining performance.
+     * This field must be initialized by the caller.
+     */
+    size_t            message_size;


I have question about "must be initialized by the caller". Does caller must initialized the field or we can leave it empty (aka corresponding field_mask is not set?)

"must be initialized by the caller" means that the field must be initialized, and the corresponding field in field_mask should be set. Do we need to clarify it in the doc?

Looking at implementation - if you don't set the field, it does not cause any failure. So it appears that you don't must to set the field, it just does not return any useful information.

you are right.
@gleon99 we need to fail with invalid param if message_size not passed

shamisp · 2021-05-06T13:46:22Z

src/ucp/api/ucp.h

+     * Operation type to report performance for.
+     * This field must be initialized by the caller.
+     */
+    ucp_ep_op_type_t  op_type;


the field is not user by the implementation and not tested by unit test. Why we introduce it now ?

gleon99 · 2021-05-09T12:31:09Z

@yosefe , fixed.

yosefe · 2021-05-09T13:13:11Z

src/ucp/api/ucp.h

@@ -376,7 +367,7 @@ typedef enum ucp_ep_perf_attr_field {
 */
 typedef enum {
    UCP_OP_TYPE_TAG,    /**< Tag matching */
-    UCP_OP_TYPE_AM,     /**< Active messge */
+    UCP_OP_TYPE_AM,     /**< Active message */


we should probably remove this enum

gleon99 · 2021-05-10T05:11:19Z

@yosefe , squashed.

yosefe · 2021-05-10T15:18:05Z

@shamisp can you pls look again?

shamisp · 2021-05-10T20:43:07Z

src/ucp/core/ucp_ep.c

+        attr->estimated_time = estimated_time.c + estimated_time.m;
+    }
+
+    return UCS_OK;


@yosefe If UCP_EP_PERF_ATTR_FIELD_ESTIMATED_TIME and UCP_EP_PERF_PARAM_FIELD_MESSAGE_SIZE are not set, shell we return UCS_ERR_INVALID_PARAM ?

@shamisp , done.

yosefe · 2021-05-11T08:13:41Z

src/ucp/core/ucp_ep.c

-                /* Skip CM lanes for banwidth calculation */
-                continue;
-            }
+    if (!(attr->field_mask & UCP_EP_PERF_ATTR_FIELD_ESTIMATED_TIME) ||


minor: can use ucs_test_all_flags

yosefe · 2021-05-11T08:14:31Z

src/ucp/core/ucp_ep.c

+    ucs_assert(max_bandwidth > 0);
+    iface_attr = ucp_worker_iface_get_attr(worker, max_bandwidth_rsc_index);
+    estimated_time.c = ucp_tl_iface_latency(context, &iface_attr->latency);
+    estimated_time.m = param->message_size / max_bandwidth;
+    attr->estimated_time = estimated_time.c + estimated_time.m;


maybe remove assert?

indent = on column

gleon99 · 2021-05-11T08:26:21Z

@yosefe , fixed.

gleon99 · 2021-05-11T08:46:12Z

@yosefe , squashed.

yosefe · 2021-05-11T13:01:20Z

bot:pipe:retest

gleon99 commented Feb 25, 2021

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gleon99 mentioned this pull request Mar 4, 2021

UCT/API: Support interface query by operation and memory type #6137

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shamisp changed the title ~~UCP/API: Support endpoint query~~ UCP/API: Support endpoint performance evaluation Mar 25, 2021

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gleon99 force-pushed the ucp-ep-query branch from 9ec8cb1 to eaed025 Compare May 5, 2021 10:14

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UCP/API: Support endpoint query

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gleon99 force-pushed the ucp-ep-query branch from 2df4b6c to a186786 Compare May 11, 2021 08:46

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yosefe merged commit 9abf1fc into openucx:master May 11, 2021

		UCP_OP_AMO32, /*< 32-bit atomic operations /
		UCP_OP_AMO64 /*< 64-bit atomic operations /

		ucp_rsc_index_t rsc_index = 0, max_bandwidth_rsc_index = 0;
		double bandwidth = 0, max_bandwidth = 0;

UCP/API: Support endpoint performance evaluation #6403

UCP/API: Support endpoint performance evaluation #6403

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gleon99 commented Feb 25, 2021

What

Why ?

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