1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
|
/*-------------------------------------------------------------------------
*
* test_json_parser_perf.c
* Performance test program for both flavors of the JSON parser
*
* Copyright (c) 2024, PostgreSQL Global Development Group
*
* IDENTIFICATION
* src/test/modules/test_json_parser/test_json_parser_perf.c
*
* This program tests either the standard (recursive descent) JSON parser
* or the incremental (table driven) parser, but without breaking the input
* into chunks in the latter case. Thus it can be used to compare the pure
* parsing speed of the two parsers. If the "-i" option is used, then the
* table driven parser is used. Otherwise, the recursive descent parser is
* used.
*
* The remaining arguments are the number of parsing iterations to be done
* and the file containing the JSON input.
*
*-------------------------------------------------------------------------
*/
#include "postgres_fe.h"
#include "common/jsonapi.h"
#include "common/logging.h"
#include "lib/stringinfo.h"
#include "mb/pg_wchar.h"
#include <stdio.h>
#include <string.h>
#define BUFSIZE 6000
int
main(int argc, char **argv)
{
char buff[BUFSIZE];
FILE *json_file;
JsonParseErrorType result;
JsonLexContext *lex;
StringInfoData json;
int n_read;
int iter;
int use_inc = 0;
pg_logging_init(argv[0]);
initStringInfo(&json);
if (strcmp(argv[1], "-i") == 0)
{
use_inc = 1;
argv++;
}
sscanf(argv[1], "%d", &iter);
if ((json_file = fopen(argv[2], PG_BINARY_R)) == NULL)
pg_fatal("Could not open input file '%s': %m", argv[2]);
while ((n_read = fread(buff, 1, 6000, json_file)) > 0)
{
appendBinaryStringInfo(&json, buff, n_read);
}
fclose(json_file);
for (int i = 0; i < iter; i++)
{
if (use_inc)
{
lex = makeJsonLexContextIncremental(NULL, PG_UTF8, false);
result = pg_parse_json_incremental(lex, &nullSemAction,
json.data, json.len,
true);
freeJsonLexContext(lex);
}
else
{
lex = makeJsonLexContextCstringLen(NULL, json.data, json.len,
PG_UTF8, false);
result = pg_parse_json(lex, &nullSemAction);
freeJsonLexContext(lex);
}
if (result != JSON_SUCCESS)
pg_fatal("unexpected result %d (expecting %d) on parse",
result, JSON_SUCCESS);
}
exit(0);
}
|
