87 lines
2.2 KiB
C
87 lines
2.2 KiB
C
/*-------------------------------------------------------------------------
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*
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* test_json_parser_perf.c
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* Performance test program for both flavors of the JSON parser
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*
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* Copyright (c) 2024, PostgreSQL Global Development Group
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*
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* IDENTIFICATION
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* src/test/modules/test_json_parser/test_json_parser_perf.c
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*
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* This program tests either the standard (recursive descent) JSON parser
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* or the incremental (table driven) parser, but without breaking the input
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* into chunks in the latter case. Thus it can be used to compare the pure
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* parsing speed of the two parsers. If the "-i" option is used, then the
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* table driven parser is used. Otherwise, the recursive descent parser is
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* used.
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*
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* The remaining arguments are the number of parsing iterations to be done
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* and the file containing the JSON input.
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres_fe.h"
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#include "common/jsonapi.h"
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#include "common/logging.h"
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#include "lib/stringinfo.h"
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#include "mb/pg_wchar.h"
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#include <stdio.h>
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#include <string.h>
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#define BUFSIZE 6000
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int
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main(int argc, char **argv)
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{
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char buff[BUFSIZE];
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FILE *json_file;
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JsonParseErrorType result;
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JsonLexContext *lex;
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StringInfoData json;
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int n_read;
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int iter;
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int use_inc = 0;
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initStringInfo(&json);
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if (strcmp(argv[1], "-i") == 0)
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{
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use_inc = 1;
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argv++;
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}
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sscanf(argv[1], "%d", &iter);
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if ((json_file = fopen(argv[2], "r")) == NULL)
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pg_fatal("Could not open input file '%s': %m", argv[2]);
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while ((n_read = fread(buff, 1, 6000, json_file)) > 0)
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{
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appendBinaryStringInfo(&json, buff, n_read);
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}
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fclose(json_file);
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for (int i = 0; i < iter; i++)
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{
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if (use_inc)
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{
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lex = makeJsonLexContextIncremental(NULL, PG_UTF8, false);
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result = pg_parse_json_incremental(lex, &nullSemAction,
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json.data, json.len,
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true);
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freeJsonLexContext(lex);
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}
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else
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{
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lex = makeJsonLexContextCstringLen(NULL, json.data, json.len,
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PG_UTF8, false);
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result = pg_parse_json(lex, &nullSemAction);
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freeJsonLexContext(lex);
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}
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if (result != JSON_SUCCESS)
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pg_fatal("unexpected result %d (expecting %d) on parse",
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result, JSON_SUCCESS);
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}
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exit(0);
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}
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