pq_flush: send() failed: Broken pipe

Hello.

When I carried out SQL sentence in PostgreSQL7.3.8 environment,
PostgreSQL outputs the following error messages.
==============================
Dec 19 13:50:32 gyomu01 postgres[807]: [11] LOG: pq_flush: send() failed: Broken pipe
Dec 19 13:50:33 gyomu01 postgres[807]: [12] LOG: pq_recvbuf: unexpected EOF on client connection
==============================

Why these messages appear?
Please teach me about a workaround of a problem.

Work procedures are as follows.
(1) I install PostgreSQL7.3.8 in a HP-UX machine
(2) I carry out initdb to create gyomuDB
(3) I carry out an SQL sentence to make TABLE and FUNCTION in gyomuDB
% psql -d gyomuDB -f 003.sql

In 003.sql, I create various tables and indexes, but the following SQL sentences terminated abnormally.
(There are 1500 lines in the whole file, and it is the extract as follows.)
#######################
CREATE FUNCTION mon_CreateTable_WbemMonitorLog( text ) RETURNS integerAS'
DECLARE
str_basename ALIAS FOR $1;
str_sql text;
str_tablename text;
nb integer;
nb_end integer;
BEGIN
nb := 0;
nb_end := 999;
while nb <= nb_end loop
-- table
str_tablename := str_basename || CAST( nb AS text );
str_sql := ''CREATE TABLE '' || str_tablename
|| ''(''
|| ''MonID int NOT NULL ,''
|| ''CategoryID int NOT NULL ,''
|| ''ExtensionID int NOT NULL ,''
|| ''SummaryID int NOT NULL ,''
|| ''KeyValue varchar (256) NULL ,''
|| ''Data varchar (512) NULL ,''
|| ''GetDate timestamp NOT NULL ,''
|| ''Status int NOT NULL ,''
|| ''Summarized int NOT NULL);'';
execute str_sql;
nb := nb + 1;
end loop;
RETURN ( 0 );
END;
'
LANGUAGE 'plpgsql';
SELECT mon_CreateTable_WbemMonitorLog( 'WbemMonitorLogMinute_' );
SELECT mon_CreateTable_WbemMonitorLog( 'WbemMonitorLogHour_' );
SELECT mon_CreateTable_WbemMonitorLog( 'WbemMonitorLogDay_' );
DROP FUNCTION mon_CreateTable_WbemMonitorLog( text );
#######################

This function worked with various servers normally.
But this function terminated abnormally only with a certain server.

A difference is only that server that this function terminates abnormally with has high-speed multiprocessor.
Besides this, there is not remarkable difference.

When this function worked normally, this function outputs as follows.
#######################
CREATE FUNCTION
mon_createtable_wbemmonitorlog
--------------------------------
0
(1 row)

mon_createtable_wbemmonitorlog
--------------------------------
0
(1 row)

mon_createtable_wbemmonitorlog
--------------------------------
0
(1 row)

DROP FUNCTION
#######################

When this function terminated abnormally, psql outputs only "CREATE FUNCTION".
And psql command terminated.

In other words I suppose that I fall in practice (SELECT) of the first function.

I checked the disk use situation then, the neck in a resource was not found.
I understand this error isn't caused by stringency of a resource.

In addition, this error caused when I am creating DB
just after PostgreSQL installation.

I can't think that there is a lot access in PostgreSQL.
I can't think that DB size is big and lacked memory.

<About a signal>
I carry out the above (3) via a script written in bash.
The script was finished by signal 16 then(SIGUSR1).

# ./gyomuDB_setup.com
Signal 16

I saw a source of PostgreSQL and various documents.
And I understood about a "SIGUSR1" signal as follows.

* A "SIGUSR1" signal is used only for timing making a transaction log
to restore DB at the time of DB disorder outbreak.
* All the transaction processing is carried out by the child process that is a backend.
But when accumulated a fixed quantity transaction log,
postmaster carries out checkpoint processing
by transmitting a "SIGUSR1" signal to postmaster from a backend.
(Actually, postmaster generates child process more and carries it out)

Actually this signal is transmitted not to postmaster but to psql, and psql seems to stop.

<postgresql.conf>
--------------------------------------------------
#
# Connection Parameters
#
#tcpip_socket = false
#ssl = false

#max_connections = 32
#superuser_reserved_connections = 2

#port = 5432
#hostname_lookup = false
#show_source_port = false

#unix_socket_directory = ''
#unix_socket_group = ''
#unix_socket_permissions = 0777 # octal

#virtual_host = ''

#krb_server_keyfile = ''

#
# Shared Memory Size
#
#shared_buffers = 64 # min max_connections*2 or 16, 8KB each
#max_fsm_relations = 1000 # min 10, fsm is free space map, ~40 bytes
#max_fsm_pages = 10000 # min 1000, fsm is free space map, ~6 bytes
#max_locks_per_transaction = 64 # min 10
#wal_buffers = 8 # min 4, typically 8KB each

shared_buffers = 256
max_fsm_relations = 4000
max_fsm_pages = 131072
max_locks_per_transaction = 512

#
# Non-shared Memory Sizes
#
#sort_mem = 1024 # min 64, size in KB
#vacuum_mem = 8192 # min 1024, size in KB

#
# Write-ahead log (WAL)
#
#checkpoint_segments = 3 # in logfile segments, min 1, 16MB each
#checkpoint_timeout = 300 # range 30-3600, in seconds
#
#commit_delay = 0 # range 0-100000, in microseconds
#commit_siblings = 5 # range 1-1000
#
#fsync = true
#wal_sync_method = fsync # the default varies across platforms:
# # fsync, fdatasync, open_sync, or open_datasync
#wal_debug = 0 # range 0-16

#
# Optimizer Parameters
#
#enable_seqscan = true
#enable_indexscan = true
#enable_tidscan = true
#enable_sort = true
#enable_nestloop = true
#enable_mergejoin = true
#enable_hashjoin = true

#effective_cache_size = 1000 # typically 8KB each
#random_page_cost = 4 # units are one sequential page fetch cost
#cpu_tuple_cost = 0.01 # (same)
#cpu_index_tuple_cost = 0.001 # (same)
#cpu_operator_cost = 0.0025 # (same)

#default_statistics_target = 10 # range 1-1000

#
# GEQO Optimizer Parameters
#
#geqo = true
#geqo_selection_bias = 2.0 # range 1.5-2.0
#geqo_threshold = 11
#geqo_pool_size = 0 # default based on tables in statement,
# range 128-1024
#geqo_effort = 1
#geqo_generations = 0
#geqo_random_seed = -1 # auto-compute seed

#
# Message display
#
#server_min_messages = notice # Values, in order of decreasing detail:
# debug5, debug4, debug3, debug2, debug1,
# info, notice, warning, error, log, fatal,
# panic
#client_min_messages = notice # Values, in order of decreasing detail:
# debug5, debug4, debug3, debug2, debug1,
# log, info, notice, warning, error
#silent_mode = false

#log_connections = false
#log_pid = false
#log_statement = false
#log_duration = false
#log_timestamp = false

#log_min_error_statement = panic # Values in order of increasing severity:
# debug5, debug4, debug3, debug2, debug1,
# info, notice, warning, error, panic(off)

#debug_print_parse = false
#debug_print_rewritten = false
#debug_print_plan = false
#debug_pretty_print = false

#explain_pretty_print = true

# requires USE_ASSERT_CHECKING
#debug_assertions = true

#
# Syslog
#
#syslog = 0 # range 0-2
#syslog_facility = 'LOCAL0'
#syslog_ident = 'postgres'

#
# Statistics
#
#show_parser_stats = false
#show_planner_stats = false
#show_executor_stats = false
#show_statement_stats = false

# requires BTREE_BUILD_STATS
#show_btree_build_stats = false

#
# Access statistics collection
#
#stats_start_collector = true
#stats_reset_on_server_start = true
#stats_command_string = false
#stats_row_level = false
#stats_block_level = false

#
# Lock Tracing
#
#trace_notify = false

# requires LOCK_DEBUG
#trace_locks = false
#trace_userlocks = false
#trace_lwlocks = false
#debug_deadlocks = false
#trace_lock_oidmin = 16384
#trace_lock_table = 0

#
# Misc
#
#autocommit = true
#dynamic_library_path = '$libdir'
#search_path = '$user,public'
#datestyle = 'iso, us'
#timezone = unknown # actually, defaults to TZ environment setting
#australian_timezones = false
#client_encoding = sql_ascii # actually, defaults to database encoding
#authentication_timeout = 60 # 1-600, in seconds
#deadlock_timeout = 1000 # in milliseconds
#default_transaction_isolation = 'read committed'
#max_expr_depth = 10000 # min 10
#max_files_per_process = 1000 # min 25
#password_encryption = true
#sql_inheritance = true
#transform_null_equals = false
#statement_timeout = 0 # 0 is disabled, in milliseconds
#db_user_namespace = false

deadlock_timeout = 10000
--------------------------------------------------

Besides, if there is necessary information, please point it out.

Thank you in advance.