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executor.c
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/*
* executor.c
*
* Common routines related to query execution phase
* ----
* Copyright 2011-2023 (C) KaiGai Kohei <[email protected]>
* Copyright 2014-2023 (C) PG-Strom Developers Team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the PostgreSQL License.
*/
#include "pg_strom.h"
#include "cuda_common.h"
/*
* XpuConnection
*/
struct XpuConnection
{
dlist_node chain; /* link to gpuserv_connection_slots */
char devname[32];
int dev_index; /* cuda_dindex or dpu_endpoint_id */
volatile pgsocket sockfd;
volatile int terminated; /* positive: normal exit
* negative: exit by errors */
ResourceOwner resowner;
pthread_t worker;
pthread_mutex_t mutex;
int num_running_cmds;
int num_ready_cmds;
dlist_head ready_cmds_list; /* ready, but not fetched yet */
dlist_head active_cmds_list; /* currently in-use */
kern_errorbuf errorbuf;
};
/* see xact.c */
extern int nParallelCurrentXids;
extern TransactionId *ParallelCurrentXids;
/* static variables */
static dlist_head xpu_connections_list;
/*
* Worker thread to receive response messages
*/
static void *
__xpuConnectAllocCommand(void *__priv, size_t sz)
{
return malloc(sz);
}
static void
__xpuConnectAttachCommand(void *__priv, XpuCommand *xcmd)
{
XpuConnection *conn = __priv;
xcmd->priv = conn;
pthreadMutexLock(&conn->mutex);
Assert(conn->num_running_cmds > 0);
conn->num_running_cmds--;
if (xcmd->tag == XpuCommandTag__Error)
{
if (conn->errorbuf.errcode == ERRCODE_STROM_SUCCESS)
{
Assert(xcmd->u.error.errcode != ERRCODE_STROM_SUCCESS);
memcpy(&conn->errorbuf, &xcmd->u.error, sizeof(kern_errorbuf));
}
free(xcmd);
}
else
{
Assert(xcmd->tag == XpuCommandTag__Success ||
xcmd->tag == XpuCommandTag__CPUFallback);
dlist_push_tail(&conn->ready_cmds_list, &xcmd->chain);
conn->num_ready_cmds++;
}
SetLatch(MyLatch);
pthreadMutexUnlock(&conn->mutex);
}
TEMPLATE_XPU_CONNECT_RECEIVE_COMMANDS(__xpuConnect)
static void *
__xpuConnectSessionWorker(void *__priv)
{
XpuConnection *conn = __priv;
for (;;)
{
struct pollfd pfd;
int sockfd;
int nevents;
sockfd = conn->sockfd;
if (sockfd < 0)
break;
pfd.fd = sockfd;
pfd.events = POLLIN;
pfd.revents = 0;
nevents = poll(&pfd, 1, -1);
if (nevents < 0)
{
if (errno == EINTR)
continue;
fprintf(stderr, "[%s; %s:%d] failed on poll(2): %m\n",
conn->devname, __FILE_NAME__, __LINE__);
break;
}
else if (nevents > 0)
{
Assert(nevents == 1);
if (pfd.revents & ~POLLIN)
{
pthreadMutexLock(&conn->mutex);
conn->terminated = 1;
SetLatch(MyLatch);
pthreadMutexUnlock(&conn->mutex);
return NULL;
}
else if (pfd.revents & POLLIN)
{
if (__xpuConnectReceiveCommands(conn->sockfd,
conn,
conn->devname) < 0)
break;
}
}
}
pthreadMutexLock(&conn->mutex);
conn->terminated = -1;
SetLatch(MyLatch);
pthreadMutexUnlock(&conn->mutex);
return NULL;
}
/*
* xpuClientSendCommand
*/
void
xpuClientSendCommand(XpuConnection *conn, const XpuCommand *xcmd)
{
int sockfd = conn->sockfd;
const char *buf = (const char *)xcmd;
size_t len = xcmd->length;
ssize_t nbytes;
pthreadMutexLock(&conn->mutex);
conn->num_running_cmds++;
pthreadMutexUnlock(&conn->mutex);
while (len > 0)
{
nbytes = write(sockfd, buf, len);
if (nbytes > 0)
{
buf += nbytes;
len -= nbytes;
}
else if (nbytes == 0)
elog(ERROR, "unable to send xPU command to the service");
else if (errno == EINTR)
CHECK_FOR_INTERRUPTS();
else
elog(ERROR, "failed on write(2): %m");
}
}
/*
* xpuClientSendCommandIOV
*/
static void
xpuClientSendCommandIOV(XpuConnection *conn, struct iovec *iov, int iovcnt)
{
int sockfd = conn->sockfd;
ssize_t nbytes;
Assert(iovcnt > 0);
pthreadMutexLock(&conn->mutex);
conn->num_running_cmds++;
pthreadMutexUnlock(&conn->mutex);
while (iovcnt > 0)
{
nbytes = writev(sockfd, iov, iovcnt);
if (nbytes > 0)
{
do {
if (iov->iov_len <= nbytes)
{
nbytes -= iov->iov_len;
iov++;
iovcnt--;
}
else
{
iov->iov_base = (char *)iov->iov_base + nbytes;
iov->iov_len -= nbytes;
break;
}
} while (iovcnt > 0 && nbytes > 0);
}
else if (nbytes == 0)
elog(ERROR, "unable to send xPU command to the service");
else if (errno == EINTR)
CHECK_FOR_INTERRUPTS();
else
elog(ERROR, "failed on writev(2): %m");
}
}
/*
* xpuClientPutResponse
*/
void
xpuClientPutResponse(XpuCommand *xcmd)
{
XpuConnection *conn = xcmd->priv;
pthreadMutexLock(&conn->mutex);
dlist_delete(&xcmd->chain);
pthreadMutexUnlock(&conn->mutex);
free(xcmd);
}
/*
* xpuClientCloseSession
*/
void
xpuClientCloseSession(XpuConnection *conn)
{
XpuCommand *xcmd;
dlist_node *dnode;
/* ensure termination of worker thread */
close(conn->sockfd);
conn->sockfd = -1;
pg_memory_barrier();
pthread_kill(conn->worker, SIGPOLL);
pthread_join(conn->worker, NULL);
while (!dlist_is_empty(&conn->ready_cmds_list))
{
dnode = dlist_pop_head_node(&conn->ready_cmds_list);
xcmd = dlist_container(XpuCommand, chain, dnode);
free(xcmd);
}
while (!dlist_is_empty(&conn->active_cmds_list))
{
dnode = dlist_pop_head_node(&conn->active_cmds_list);
xcmd = dlist_container(XpuCommand, chain, dnode);
free(xcmd);
}
dlist_delete(&conn->chain);
free(conn);
}
/*
* xpuclientCleanupConnections
*/
static void
xpuclientCleanupConnections(ResourceReleasePhase phase,
bool isCommit,
bool isTopLevel,
void *arg)
{
dlist_mutable_iter iter;
if (phase != RESOURCE_RELEASE_BEFORE_LOCKS)
return;
dlist_foreach_modify(iter, &xpu_connections_list)
{
XpuConnection *conn = dlist_container(XpuConnection,
chain, iter.cur);
if (conn->resowner == CurrentResourceOwner)
{
if (isCommit)
elog(LOG, "Bug? GPU connection %d is not closed on ExecEnd",
conn->sockfd);
xpuClientCloseSession(conn);
}
}
}
/* ----------------------------------------------------------------
*
* Routines to build session-information
*
* ----------------------------------------------------------------
*/
static void
__build_session_param_info(pgstromTaskState *pts,
kern_session_info *session,
StringInfo buf)
{
pgstromPlanInfo *pp_info = pts->pp_info;
ExprContext *econtext = pts->css.ss.ps.ps_ExprContext;
ParamListInfo param_info = econtext->ecxt_param_list_info;
ListCell *lc;
Assert(param_info != NULL);
session->nparams = param_info->numParams;
foreach (lc, pp_info->used_params)
{
Param *param = lfirst(lc);
Datum param_value;
bool param_isnull;
uint32_t offset;
Assert(param->paramid >= 0 &&
param->paramid < session->nparams);
if (param->paramkind == PARAM_EXEC)
{
/* See ExecEvalParamExec */
ParamExecData *prm = &(econtext->ecxt_param_exec_vals[param->paramid]);
if (prm->execPlan)
{
/* Parameter not evaluated yet, so go do it */
ExecSetParamPlan(prm->execPlan, econtext);
/* ExecSetParamPlan should have processed this param... */
Assert(prm->execPlan == NULL);
}
param_isnull = prm->isnull;
param_value = prm->value;
}
else if (param->paramkind == PARAM_EXTERN)
{
/* See ExecEvalParamExtern */
ParamExternData *prm, prmData;
if (param_info->paramFetch != NULL)
prm = param_info->paramFetch(param_info,
param->paramid,
false, &prmData);
else
prm = ¶m_info->params[param->paramid - 1];
if (!OidIsValid(prm->ptype))
elog(ERROR, "no value found for parameter %d", param->paramid);
if (prm->ptype != param->paramtype)
elog(ERROR, "type of parameter %d (%s) does not match that when preparing the plan (%s)",
param->paramid,
format_type_be(prm->ptype),
format_type_be(param->paramtype));
param_isnull = prm->isnull;
param_value = prm->value;
}
else
{
elog(ERROR, "Bug? unexpected parameter kind: %d",
(int)param->paramkind);
}
if (param_isnull)
offset = 0;
else
{
int16 typlen;
bool typbyval;
get_typlenbyval(param->paramtype, &typlen, &typbyval);
if (typbyval)
{
offset = __appendBinaryStringInfo(buf,
(char *)¶m_value,
typlen);
}
else if (typlen > 0)
{
offset = __appendBinaryStringInfo(buf,
DatumGetPointer(param_value),
typlen);
}
else if (typlen == -1)
{
struct varlena *temp = PG_DETOAST_DATUM(param_value);
offset = __appendBinaryStringInfo(buf, temp, VARSIZE(temp));
if (param_value != PointerGetDatum(temp))
pfree(temp);
}
else
{
elog(ERROR, "Not a supported data type for kernel parameter: %s",
format_type_be(param->paramtype));
}
}
Assert(param->paramid >= 0 && param->paramid < session->nparams);
session->poffset[param->paramid] = offset;
}
}
/*
* __build_session_kvars_defs
*/
static int
__count_session_kvars_defs_subfields(codegen_kvar_defitem *kvdef)
{
int count = list_length(kvdef->kv_subfields);
ListCell *lc;
foreach (lc, kvdef->kv_subfields)
{
codegen_kvar_defitem *__kvdef = lfirst(lc);
count += __count_session_kvars_defs_subfields(__kvdef);
}
return count;
}
static int
__setup_session_kvars_defs_array(kern_varslot_desc *vslot_desc_root,
kern_varslot_desc *vslot_desc_base,
List *kvars_deflist)
{
kern_varslot_desc *vs_desc = vslot_desc_base;
int nitems = list_length(kvars_deflist);
int count;
ListCell *lc;
vslot_desc_base += nitems;
foreach (lc, kvars_deflist)
{
codegen_kvar_defitem *kvdef = lfirst(lc);
vs_desc->vs_type_code = kvdef->kv_type_code;
vs_desc->vs_typbyval = kvdef->kv_typbyval;
vs_desc->vs_typalign = kvdef->kv_typalign;
vs_desc->vs_typlen = kvdef->kv_typlen;
vs_desc->vs_typmod = exprTypmod((Node *)kvdef->kv_expr);
if (kvdef->kv_subfields != NIL)
{
count = __setup_session_kvars_defs_array(vslot_desc_root,
vslot_desc_base,
kvdef->kv_subfields);
vs_desc->idx_subfield = (vslot_desc_base - vslot_desc_root);
vs_desc->num_subfield = count;
vslot_desc_base += count;
nitems += count;
}
vs_desc++;
}
return nitems;
}
static void
__build_session_kvars_defs(pgstromTaskState *pts,
kern_session_info *session,
StringInfo buf)
{
pgstromPlanInfo *pp_info = pts->pp_info;
kern_varslot_desc *kvars_defs;
uint32_t nitems = list_length(pp_info->kvars_deflist);
uint32_t nrooms = nitems;
uint32_t sz;
ListCell *lc;
foreach (lc, pp_info->kvars_deflist)
{
codegen_kvar_defitem *kvdef = lfirst(lc);
nrooms += __count_session_kvars_defs_subfields(kvdef);
}
sz = sizeof(kern_varslot_desc) * nrooms;
kvars_defs = alloca(sz);
memset(kvars_defs, 0, sz);
__setup_session_kvars_defs_array(kvars_defs,
kvars_defs,
pp_info->kvars_deflist);
session->kcxt_kvars_nrooms = nrooms;
session->kcxt_kvars_nslots = nitems;
session->kcxt_kvars_defs = __appendBinaryStringInfo(buf, kvars_defs, sz);
}
static uint32_t
__build_session_xact_state(StringInfo buf)
{
Size bufsz;
char *buffer;
bufsz = EstimateTransactionStateSpace();
buffer = alloca(bufsz);
SerializeTransactionState(bufsz, buffer);
return __appendBinaryStringInfo(buf, buffer, bufsz);
}
static uint32_t
__build_session_timezone(StringInfo buf)
{
uint32_t offset = 0;
if (session_timezone)
{
offset = __appendBinaryStringInfo(buf, session_timezone,
sizeof(struct pg_tz));
}
return offset;
}
static uint32_t
__build_session_encode(StringInfo buf)
{
xpu_encode_info encode;
memset(&encode, 0, sizeof(xpu_encode_info));
strncpy(encode.encname,
GetDatabaseEncodingName(),
sizeof(encode.encname));
encode.enc_maxlen = pg_database_encoding_max_length();
encode.enc_mblen = NULL;
return __appendBinaryStringInfo(buf, &encode, sizeof(xpu_encode_info));
}
static void
__build_session_lconvert(kern_session_info *session)
{
struct lconv *lconvert = PGLC_localeconv();
/* see comments about frac_digits in cash_in() */
session->session_currency_frac_digits = lconvert->frac_digits;
}
const XpuCommand *
pgstromBuildSessionInfo(pgstromTaskState *pts,
uint32_t join_inner_handle,
TupleDesc groupby_tdesc_final)
{
pgstromSharedState *ps_state = pts->ps_state;
pgstromPlanInfo *pp_info = pts->pp_info;
ExprContext *econtext = pts->css.ss.ps.ps_ExprContext;
ParamListInfo param_info = econtext->ecxt_param_list_info;
uint32_t nparams = (param_info ? param_info->numParams : 0);
uint32_t session_sz;
kern_session_info *session;
XpuCommand *xcmd;
StringInfoData buf;
bytea *xpucode;
initStringInfo(&buf);
session_sz = offsetof(kern_session_info, poffset[nparams]);
session = alloca(session_sz);
memset(session, 0, session_sz);
__appendZeroStringInfo(&buf, session_sz);
if (param_info)
__build_session_param_info(pts, session, &buf);
if (pp_info->kvars_deflist != NIL)
__build_session_kvars_defs(pts, session, &buf);
if (pp_info->kexp_load_vars_packed)
{
xpucode = pp_info->kexp_load_vars_packed;
session->xpucode_load_vars_packed =
__appendBinaryStringInfo(&buf,
VARDATA(xpucode),
VARSIZE(xpucode) - VARHDRSZ);
}
if (pp_info->kexp_move_vars_packed)
{
xpucode = pp_info->kexp_move_vars_packed;
session->xpucode_move_vars_packed =
__appendBinaryStringInfo(&buf,
VARDATA(xpucode),
VARSIZE(xpucode) - VARHDRSZ);
}
if (pp_info->kexp_scan_quals)
{
xpucode = pp_info->kexp_scan_quals;
session->xpucode_scan_quals =
__appendBinaryStringInfo(&buf,
VARDATA(xpucode),
VARSIZE(xpucode) - VARHDRSZ);
}
if (pp_info->kexp_join_quals_packed)
{
xpucode = pp_info->kexp_join_quals_packed;
session->xpucode_join_quals_packed =
__appendBinaryStringInfo(&buf,
VARDATA(xpucode),
VARSIZE(xpucode) - VARHDRSZ);
}
if (pp_info->kexp_hash_keys_packed)
{
xpucode = pp_info->kexp_hash_keys_packed;
session->xpucode_hash_values_packed =
__appendBinaryStringInfo(&buf,
VARDATA(xpucode),
VARSIZE(xpucode) - VARHDRSZ);
}
if (pp_info->kexp_gist_evals_packed)
{
xpucode = pp_info->kexp_gist_evals_packed;
session->xpucode_gist_evals_packed =
__appendBinaryStringInfo(&buf,
VARDATA(xpucode),
VARSIZE(xpucode) - VARHDRSZ);
}
if (pp_info->kexp_projection)
{
xpucode = pp_info->kexp_projection;
session->xpucode_projection =
__appendBinaryStringInfo(&buf,
VARDATA(xpucode),
VARSIZE(xpucode) - VARHDRSZ);
}
if (pp_info->kexp_groupby_keyhash)
{
xpucode = pp_info->kexp_groupby_keyhash;
session->xpucode_groupby_keyhash =
__appendBinaryStringInfo(&buf,
VARDATA(xpucode),
VARSIZE(xpucode) - VARHDRSZ);
}
if (pp_info->kexp_groupby_keyload)
{
xpucode = pp_info->kexp_groupby_keyload;
session->xpucode_groupby_keyload =
__appendBinaryStringInfo(&buf,
VARDATA(xpucode),
VARSIZE(xpucode) - VARHDRSZ);
}
if (pp_info->kexp_groupby_keycomp)
{
xpucode = pp_info->kexp_groupby_keycomp;
session->xpucode_groupby_keycomp =
__appendBinaryStringInfo(&buf,
VARDATA(xpucode),
VARSIZE(xpucode) - VARHDRSZ);
}
if (pp_info->kexp_groupby_actions)
{
xpucode = pp_info->kexp_groupby_actions;
session->xpucode_groupby_actions =
__appendBinaryStringInfo(&buf,
VARDATA(xpucode),
VARSIZE(xpucode) - VARHDRSZ);
}
if (groupby_tdesc_final)
{
size_t sz = estimate_kern_data_store(groupby_tdesc_final);
kern_data_store *kds_temp = (kern_data_store *)alloca(sz);
char format = KDS_FORMAT_ROW;
uint32_t hash_nslots = 0;
size_t kds_length = (4UL << 20); /* 4MB */
if (pp_info->kexp_groupby_keyhash &&
pp_info->kexp_groupby_keyload &&
pp_info->kexp_groupby_keycomp)
{
double n_groups = pts->css.ss.ps.plan->plan_rows;
format = KDS_FORMAT_HASH;
if (n_groups <= 5000.0)
hash_nslots = 20000;
else if (n_groups <= 4000000.0)
hash_nslots = 20000 + (int)(2.0 * n_groups);
else
hash_nslots = 8020000 + n_groups;
kds_length = (1UL << 30); /* 1GB */
}
setup_kern_data_store(kds_temp, groupby_tdesc_final, kds_length, format);
kds_temp->hash_nslots = hash_nslots;
session->groupby_kds_final = __appendBinaryStringInfo(&buf, kds_temp, sz);
session->groupby_prepfn_bufsz = pp_info->groupby_prepfn_bufsz;
session->groupby_ngroups_estimation = pts->css.ss.ps.plan->plan_rows;
}
/* other database session information */
session->query_plan_id = ps_state->query_plan_id;
session->kcxt_kvecs_bufsz = pp_info->kvecs_bufsz;
session->kcxt_kvecs_ndims = pp_info->kvecs_ndims;
session->kcxt_extra_bufsz = pp_info->extra_bufsz;
session->cuda_stack_size = pp_info->cuda_stack_size;
session->xpu_task_flags = pts->xpu_task_flags;
session->hostEpochTimestamp = SetEpochTimestamp();
session->xactStartTimestamp = GetCurrentTransactionStartTimestamp();
session->session_xact_state = __build_session_xact_state(&buf);
session->session_timezone = __build_session_timezone(&buf);
session->session_encode = __build_session_encode(&buf);
__build_session_lconvert(session);
session->pgsql_port_number = PostPortNumber;
session->pgsql_plan_node_id = pts->css.ss.ps.plan->plan_node_id;
session->join_inner_handle = join_inner_handle;
memcpy(buf.data, session, session_sz);
/* setup XpuCommand */
xcmd = palloc(offsetof(XpuCommand, u.session) + buf.len);
memset(xcmd, 0, offsetof(XpuCommand, u.session));
xcmd->magic = XpuCommandMagicNumber;
xcmd->tag = XpuCommandTag__OpenSession;
xcmd->length = offsetof(XpuCommand, u.session) + buf.len;
memcpy(&xcmd->u.session, buf.data, buf.len);
pfree(buf.data);
return xcmd;
}
/*
* pgstromTaskStateBeginScan
*/
static bool
pgstromTaskStateBeginScan(pgstromTaskState *pts)
{
pgstromSharedState *ps_state = pts->ps_state;
XpuConnection *conn = pts->conn;
uint32_t curval, newval;
Assert(conn != NULL);
curval = pg_atomic_read_u32(&ps_state->parallel_task_control);
do {
if ((curval & 1) != 0)
return false;
newval = curval + 2;
} while (!pg_atomic_compare_exchange_u32(&ps_state->parallel_task_control,
&curval, newval));
pg_atomic_fetch_add_u32(&pts->rjoin_devs_count[conn->dev_index], 1);
return true;
}
/*
* pgstromTaskStateEndScan
*/
static bool
pgstromTaskStateEndScan(pgstromTaskState *pts, kern_final_task *kfin)
{
pgstromSharedState *ps_state = pts->ps_state;
XpuConnection *conn = pts->conn;
uint32_t curval, newval;
Assert(conn != NULL);
memset(kfin, 0, sizeof(kern_final_task));
curval = pg_atomic_read_u32(&ps_state->parallel_task_control);
do {
Assert(curval >= 2);
newval = ((curval - 2) | 1);
} while (!pg_atomic_compare_exchange_u32(&ps_state->parallel_task_control,
&curval, newval));
if (newval == 1)
kfin->final_plan_node = true;
if (pg_atomic_sub_fetch_u32(&pts->rjoin_devs_count[conn->dev_index], 1) == 0)
kfin->final_this_device = true;
return (kfin->final_plan_node | kfin->final_this_device);
}
/*
* pgstromTaskStateResetScan
*/
static void
pgstromTaskStateResetScan(pgstromTaskState *pts)
{
pgstromSharedState *ps_state = pts->ps_state;
int num_devs = 0;
/*
* pgstromExecTaskState() is never called on the single process
* execution, thus we have no state to reset.
*/
if (!ps_state)
return;
if ((pts->xpu_task_flags & DEVKIND__NVIDIA_GPU) != 0)
num_devs = numGpuDevAttrs;
else if ((pts->xpu_task_flags & DEVKIND__NVIDIA_DPU) != 0)
num_devs = DpuStorageEntryCount();
else
elog(ERROR, "Bug? no GPU/DPUs are in use");
pg_atomic_write_u32(&ps_state->parallel_task_control, 0);
pg_atomic_write_u32(pts->rjoin_exit_count, 0);
for (int i=0; i < num_devs; i++)
pg_atomic_write_u32(pts->rjoin_devs_count + i, 0);
if (pts->arrow_state)
{
pgstromArrowFdwExecReset(pts->arrow_state);
}
else if (ps_state->ss_handle == DSM_HANDLE_INVALID)
{
TableScanDesc scan = pts->css.ss.ss_currentScanDesc;
table_rescan(scan, NULL);
}
else
{
Relation rel = pts->css.ss.ss_currentRelation;
ParallelTableScanDesc pscan = (ParallelTableScanDesc)
((char *)ps_state + ps_state->parallel_scan_desc_offset);
table_parallelscan_reinitialize(rel, pscan);
}
}
/*
* __updateStatsXpuCommand
*/
static void
__updateStatsXpuCommand(pgstromTaskState *pts, const XpuCommand *xcmd)
{
if (xcmd->tag == XpuCommandTag__Success)
{
pgstromSharedState *ps_state = pts->ps_state;
int n_rels = Min(pts->num_rels, xcmd->u.results.num_rels);
pg_atomic_fetch_add_u64(&ps_state->npages_direct_read,
xcmd->u.results.npages_direct_read);
pg_atomic_fetch_add_u64(&ps_state->npages_vfs_read,
xcmd->u.results.npages_vfs_read);
pg_atomic_fetch_add_u64(&ps_state->source_ntuples_raw,
xcmd->u.results.nitems_raw);
pg_atomic_fetch_add_u64(&ps_state->source_ntuples_in,
xcmd->u.results.nitems_in);
for (int i=0; i < n_rels; i++)
{
pg_atomic_fetch_add_u64(&ps_state->inners[i].stats_gist,
xcmd->u.results.stats[i].nitems_gist);
pg_atomic_fetch_add_u64(&ps_state->inners[i].stats_join,
xcmd->u.results.stats[i].nitems_out);
}
pg_atomic_fetch_add_u64(&ps_state->result_ntuples, xcmd->u.results.nitems_out);
}
else if (xcmd->tag == XpuCommandTag__CPUFallback)
{
pgstromSharedState *ps_state = pts->ps_state;
pg_atomic_fetch_add_u64(&ps_state->npages_direct_read,
xcmd->u.fallback.npages_direct_read);
pg_atomic_fetch_add_u64(&ps_state->npages_vfs_read,
xcmd->u.fallback.npages_vfs_read);
}
}
/*
* __pickupNextXpuCommand
*
* MEMO: caller must hold 'conn->mutex'
*/
static XpuCommand *
__pickupNextXpuCommand(XpuConnection *conn)
{
XpuCommand *xcmd;
dlist_node *dnode;
Assert(conn->num_ready_cmds > 0);
dnode = dlist_pop_head_node(&conn->ready_cmds_list);
xcmd = dlist_container(XpuCommand, chain, dnode);
dlist_push_tail(&conn->active_cmds_list, &xcmd->chain);
conn->num_ready_cmds--;
return xcmd;
}
static XpuCommand *
__waitAndFetchNextXpuCommand(pgstromTaskState *pts, bool try_final_callback)
{
XpuConnection *conn = pts->conn;
XpuCommand *xcmd;
struct iovec xcmd_iov[10];
int xcmd_iovcnt;
int ev;
pthreadMutexLock(&conn->mutex);
for (;;)
{
ResetLatch(MyLatch);
/* device error checks */
if (conn->errorbuf.errcode != ERRCODE_STROM_SUCCESS)
{
pthreadMutexUnlock(&conn->mutex);
ereport(ERROR,
(errcode(conn->errorbuf.errcode),
errmsg("%s:%d %s",
conn->errorbuf.filename,
conn->errorbuf.lineno,
conn->errorbuf.message),
errhint("device at %s, function at %s",
conn->devname,
conn->errorbuf.funcname)));
}
if (!dlist_is_empty(&conn->ready_cmds_list))
{
/* ok, ready commands we have */
break;
}
else if (conn->num_running_cmds > 0)
{
/* wait for the running commands */
pthreadMutexUnlock(&conn->mutex);
}
else
{
pthreadMutexUnlock(&conn->mutex);
if (!pts->final_done)
{
kern_final_task kfin;
pts->final_done = true;
if (try_final_callback &&
pgstromTaskStateEndScan(pts, &kfin) &&
pts->cb_final_chunk != NULL)
{
xcmd = pts->cb_final_chunk(pts, &kfin, xcmd_iov, &xcmd_iovcnt);
if (xcmd)
{
xpuClientSendCommandIOV(conn, xcmd_iov, xcmd_iovcnt);
continue;
}
}
}
return NULL;
}
CHECK_FOR_INTERRUPTS();
ev = WaitLatch(MyLatch,
WL_LATCH_SET |
WL_TIMEOUT |
WL_POSTMASTER_DEATH,
1000L,
PG_WAIT_EXTENSION);
if (ev & WL_POSTMASTER_DEATH)
ereport(FATAL,
(errcode(ERRCODE_ADMIN_SHUTDOWN),
errmsg("Unexpected Postmaster dead")));
pthreadMutexLock(&conn->mutex);
}
xcmd = __pickupNextXpuCommand(conn);
pthreadMutexUnlock(&conn->mutex);
__updateStatsXpuCommand(pts, xcmd);
return xcmd;
}
static XpuCommand *
__fetchNextXpuCommand(pgstromTaskState *pts)
{
XpuConnection *conn = pts->conn;
XpuCommand *xcmd;
struct iovec xcmd_iov[10];
int xcmd_iovcnt;
int ev;
int max_async_tasks = pgstrom_max_async_tasks();
while (!pts->scan_done)
{
CHECK_FOR_INTERRUPTS();
pthreadMutexLock(&conn->mutex);
/* device error checks */
if (conn->errorbuf.errcode != ERRCODE_STROM_SUCCESS)
{
pthreadMutexUnlock(&conn->mutex);
ereport(ERROR,
(errcode(conn->errorbuf.errcode),
errmsg("%s:%d %s",
conn->errorbuf.filename,
conn->errorbuf.lineno,
conn->errorbuf.message),
errhint("device at %s, function at %s",
conn->devname,
conn->errorbuf.funcname)));
}
if ((conn->num_running_cmds + conn->num_ready_cmds) < max_async_tasks &&
(dlist_is_empty(&conn->ready_cmds_list) ||
conn->num_running_cmds < max_async_tasks / 2))
{
/*
* xPU service still has margin to enqueue new commands.
* If we have no ready commands or number of running commands
* are less than pg_strom.max_async_tasks/2, we try to load
* the next chunk and enqueue this command.
*/
pthreadMutexUnlock(&conn->mutex);
xcmd = pts->cb_next_chunk(pts, xcmd_iov, &xcmd_iovcnt);
if (!xcmd)
{
Assert(pts->scan_done);
break;
}
xpuClientSendCommandIOV(conn, xcmd_iov, xcmd_iovcnt);
}
else if (!dlist_is_empty(&conn->ready_cmds_list))
{
xcmd = __pickupNextXpuCommand(conn);
pthreadMutexUnlock(&conn->mutex);
__updateStatsXpuCommand(pts, xcmd);
return xcmd;
}
else if (conn->num_running_cmds > 0)
{
/*
* This block means we already runs enough number of concurrent
* tasks, but none of them are already finished.
* So, let's wait for the response.
*/
ResetLatch(MyLatch);
pthreadMutexUnlock(&conn->mutex);