aboutsummaryrefslogtreecommitdiffstats
path: root/research/experiments/044-specs
diff options
context:
space:
mode:
Diffstat (limited to 'research/experiments/044-specs')
-rw-r--r--research/experiments/044-specs/2026-10-18-stage2c.jsonl6
-rw-r--r--research/experiments/044-specs/json_rec.py159
-rw-r--r--research/experiments/044-specs/json_rec_time.c119
3 files changed, 284 insertions, 0 deletions
diff --git a/research/experiments/044-specs/2026-10-18-stage2c.jsonl b/research/experiments/044-specs/2026-10-18-stage2c.jsonl
new file mode 100644
index 0000000..99972d6
--- /dev/null
+++ b/research/experiments/044-specs/2026-10-18-stage2c.jsonl
@@ -0,0 +1,6 @@
+{"size":103781,"jit":"0","batch":"","c_ns_per_byte":13.050,"pure_ns_per_byte":599.753,"ratio":46.0,"instructions":25733137,"instructions_per_byte":248.0}
+{"size":103781,"python_ns_per_byte":367.8,"python_json_module_ns_per_byte":54.0}
+{"size":103781,"jit":"0","batch":"","c_ns_per_byte":13.814,"pure_ns_per_byte":600.877,"ratio":43.5,"instructions":25733137,"instructions_per_byte":248.0}
+{"size":103781,"python_ns_per_byte":365.5,"python_json_module_ns_per_byte":53.8}
+{"size":103781,"jit":"0","batch":"","c_ns_per_byte":13.141,"pure_ns_per_byte":598.454,"ratio":45.5,"instructions":25733137,"instructions_per_byte":248.0}
+{"size":103781,"python_ns_per_byte":369.3,"python_json_module_ns_per_byte":54.8}
diff --git a/research/experiments/044-specs/json_rec.py b/research/experiments/044-specs/json_rec.py
new file mode 100644
index 0000000..c7951e5
--- /dev/null
+++ b/research/experiments/044-specs/json_rec.py
@@ -0,0 +1,159 @@
+# A JSON text read into a tree by recursive descent and walked depth first for a digest: the design of aup's
+# examples/json_tree.aup in 027's stage 2c, in plain Python (the reference 140 counts its lines against; the tree is
+# Python's own values, an object kept as pairs). A text that is no JSON raises (ValueError, or IndexError past its
+# end), as the event fails.
+import re
+
+
+class Pairs(list):
+ pass
+
+
+def space(b):
+ return b in (0x20, 0x09, 0x0a, 0x0d)
+
+
+def digit(b):
+ return 0x30 <= b <= 0x39
+
+
+def hexdigit(b):
+ return digit(b) or 0x61 <= b <= 0x66 or 0x41 <= b <= 0x46
+
+
+def require(ok):
+ if not ok:
+ raise ValueError
+
+
+def code(d, i):
+ return int(d[i:i + 4], 16)
+
+
+def escape(d, i):
+ return d[i] == 0x5c and d[i + 1] == 0x75 and all(hexdigit(d[k]) for k in range(i + 2, i + 6))
+
+
+def skip(d, i):
+ while i < len(d) and space(d[i]):
+ i += 1
+ return i
+
+
+def string(d, i):
+ require(d[i] == 0x22)
+ s, j = bytearray(), i + 1
+ while d[j] != 0x22:
+ start = j
+ while d[j] != 0x22 and d[j] != 0x5c and d[j] >= 0x20:
+ j += 1
+ s += d[start:j]
+ require(d[j] >= 0x20)
+ if d[j] == 0x5c:
+ e = d[j + 1]
+ if e == 0x75:
+ require(escape(d, j))
+ u = code(d, j + 2)
+ j += 6
+ if 0xd800 <= u < 0xdc00 and j + 5 < len(d) and escape(d, j) and 0xdc00 <= code(d, j + 2) < 0xe000:
+ u = 0x10000 + ((u - 0xd800) << 10 | code(d, j + 2) - 0xdc00)
+ j += 6
+ s += chr(u).encode() # a lone surrogate raises
+ else:
+ require(e in b'"\\/bfnrt')
+ s += {0x62: b'\b', 0x66: b'\f', 0x6e: b'\n', 0x72: b'\r', 0x74: b'\t'}.get(e, bytes([e]))
+ j += 2
+ return s.decode(), j + 1
+
+
+def number(t):
+ require(re.fullmatch(r'-?(0|[1-9]\d*)(\.\d+)?([eE][+-]?\d+)?', t))
+ x = float(t)
+ require(abs(x) != float('inf'))
+ return x
+
+
+def value(d, i):
+ j = skip(d, i)
+ b = d[j]
+ if b in (0x5b, 0x7b):
+ items = [] if b == 0x5b else Pairs()
+ j = skip(d, j + 1)
+ if d[j] != b + 2:
+ while True:
+ if b == 0x5b:
+ v, k = value(d, j)
+ items.append(v)
+ else:
+ name, k = string(d, j)
+ k = skip(d, k)
+ require(d[k] == 0x3a)
+ v, k = value(d, k + 1)
+ items.append((name, v))
+ j = skip(d, k)
+ if d[j] != 0x2c:
+ break
+ j = skip(d, j + 1)
+ require(d[j] == b + 2)
+ return items, j + 1
+ if b == 0x22:
+ return string(d, j)
+ if b == 0x2d or digit(b):
+ start, j = j, j + 1
+ while j < len(d) and (digit(d[j]) or d[j] in b'.eE+-'):
+ j += 1
+ return number(d[start:j].decode()), j
+ for word, v in ((b'true', True), (b'false', False), (b'null', None)):
+ if d[j:j + len(word)] == word:
+ return v, j + len(word)
+ raise ValueError
+
+
+def walk(x, d):
+ if x is None: d['nulls'] += 1
+ elif x is True: d['trues'] += 1
+ elif x is False: d['falses'] += 1
+ elif isinstance(x, float): d['numbers'] += 1; d['sum'] += x
+ elif isinstance(x, str): d['strings'] += 1; d['text_bytes'] += len(x.encode())
+ elif isinstance(x, Pairs):
+ d['objects'] += 1
+ for k, v in x:
+ d['key_bytes'] += len(k.encode())
+ walk(v, d)
+ else:
+ d['arrays'] += 1
+ for y in x:
+ walk(y, d)
+
+
+def check(data):
+ data.decode() # UTF-8, as text(check.data) is
+ root, end = value(data, 0)
+ require(skip(data, end) == len(data))
+ d = dict(nulls=0, trues=0, falses=0, numbers=0, strings=0, arrays=0, objects=0, sum=0.0, text_bytes=0, key_bytes=0)
+ walk(root, d)
+ return d
+
+
+if __name__ == '__main__':
+ import json, os, sys, time
+ sys.setrecursionlimit(100000)
+ suite = sys.argv[1]
+ for name in sorted(os.listdir(suite)):
+ try:
+ got = check(open(os.path.join(suite, name), 'rb').read())
+ except (ValueError, IndexError, RecursionError):
+ got = None
+ assert not name.startswith('y_') or got is not None, name
+ assert not name.startswith('n_') or got is None, name
+ big = b'[' + b','.join(b'{"key%d": [1.5e3, true, null, "text \\u00e9 %d"]}' % (k, k) for k in range(2000)) + b']'
+ runs, loads = [], []
+ for _ in range(7):
+ start = time.perf_counter()
+ check(big)
+ runs.append((time.perf_counter() - start) * 1e9 / len(big))
+ start = time.perf_counter()
+ d = dict(nulls=0, trues=0, falses=0, numbers=0, strings=0, arrays=0, objects=0, sum=0.0, text_bytes=0, key_bytes=0)
+ walk(json.loads(big, object_pairs_hook=Pairs, parse_int=float), d)
+ loads.append((time.perf_counter() - start) * 1e9 / len(big))
+ print('{"size":%d,"python_ns_per_byte":%.1f,"python_json_module_ns_per_byte":%.1f}' % (len(big), sorted(runs)[3], sorted(loads)[3]))
diff --git a/research/experiments/044-specs/json_rec_time.c b/research/experiments/044-specs/json_rec_time.c
new file mode 100644
index 0000000..03c02c4
--- /dev/null
+++ b/research/experiments/044-specs/json_rec_time.c
@@ -0,0 +1,119 @@
+/* Research 140, design 027 stage 2c: aup's examples/json_tree.aup (run by
+ * Pure: a JSON text read into a tree by recursive descent, then a digest of
+ * the tree, depth first) against C:
+ * cJSON (the system's libcjson.so.1, its few declarations written here)
+ * reading the same document into its tree, and the same digest. Both digests
+ * must be equal; then each is timed (the median of seven runs of rounds).
+ *
+ * cc -O2 -std=c17 -I../../../core json_rec_time.c ../../../build/libpure.a -l:libcjson.so.1 -lm -pthread -o json_rec_time
+ * ./json_rec_time json_tree.pmod ROUNDS
+ *
+ * The document is json_time.c's: 2,000 objects of a key and an array of a
+ * number, true, null and a string with an escape. One JSON line. */
+#define _POSIX_C_SOURCE 200809L
+#include "module.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+
+typedef struct cJSON {
+ struct cJSON *next, *prev, *child;
+ int type;
+ char *valuestring;
+ int valueint;
+ double valuedouble;
+ char *string;
+} cJSON;
+cJSON *cJSON_Parse(const char *value);
+void cJSON_Delete(cJSON *item);
+enum { FALSE_ = 1, TRUE_ = 2, NULL_ = 4, NUMBER = 8, STRING = 16, ARRAY = 32, OBJECT = 64 };
+
+/* nulls, trues, falses, numbers, strings, arrays, objects, sum, text bytes, key bytes: depth first, as json_tree.aup. */
+typedef struct { double count[7], sum, text_bytes, key_bytes; } Digest;
+static void walk(const cJSON *x, Digest *d) {
+ switch (x->type & 0xFF) {
+ case NULL_: d->count[0]++; break;
+ case TRUE_: d->count[1]++; break;
+ case FALSE_: d->count[2]++; break;
+ case NUMBER: d->count[3]++, d->sum += x->valuedouble; break;
+ case STRING: d->count[4]++, d->text_bytes += (double)strlen(x->valuestring); break;
+ case ARRAY: d->count[5]++; for (const cJSON *y = x->child; y; y = y->next) walk(y, d); break;
+ default: d->count[6]++; for (const cJSON *y = x->child; y; y = y->next) d->key_bytes += (double)strlen(y->string), walk(y, d);
+ }
+}
+static Digest digest(const char *text, cJSON **queue) {
+ (void)queue;
+ Digest d = {{0}, 0, 0, 0};
+ cJSON *root = cJSON_Parse(text);
+ walk(root, &d);
+ cJSON_Delete(root);
+ return d;
+}
+
+static double now_ns(void) {
+ struct timespec t;
+ clock_gettime(CLOCK_MONOTONIC, &t);
+ return (double)t.tv_sec * 1e9 + (double)t.tv_nsec;
+}
+
+static int by_value(const void *a, const void *b) {
+ double x = *(const double *)a, y = *(const double *)b;
+ return (x > y) - (x < y);
+}
+
+int main(int argc, char **argv) {
+ if (argc != 3) { fprintf(stderr, "usage: %s MODULE ROUNDS\n", argv[0]); return 2; }
+ int rounds = atoi(argv[2]);
+ static char doc[1 << 18];
+ static cJSON *queue[1 << 16];
+ size_t n = 0;
+ doc[n++] = '[';
+ for (int k = 0; k < 2000; ++k)
+ n += (size_t)sprintf(doc + n, "%s{\"key%d\": [1.5e3, true, null, \"text \\u00e9 %d\"]}", k ? "," : "", k, k);
+ doc[n++] = ']';
+ doc[n] = 0;
+ PureModule module;
+ char error[160];
+ if (pure_module_read(argv[1], &module, error, sizeof(error)) != PURE_OK) { fprintf(stderr, "%s\n", error); return 1; }
+ PureApp app;
+ if (pure_app_start(&app, &module, (PureData){0}) != PURE_OK) return 1;
+ int check = pure_module_input(&module, "check");
+ if (pure_app_message(&app, (uint32_t)check, NULL, -1, (PureSpan){(const unsigned char *)doc, n}) != PURE_OK) {
+ fprintf(stderr, "event failed\n");
+ return 1;
+ }
+ uint64_t work = app.work;
+ Digest c = digest(doc, queue);
+ /* The states after valid: nulls, trues, falses, numbers, strings, arrays, objects, sum, text_bytes, key_bytes. */
+ const char *names[] = {"nulls", "trues", "falses", "numbers", "strings", "arrays", "objects", "sum", "text_bytes", "key_bytes"};
+ double want[] = {c.count[0], c.count[1], c.count[2], c.count[3], c.count[4], c.count[5], c.count[6], c.sum, c.text_bytes, c.key_bytes};
+ for (unsigned k = 0; k < 10; ++k) {
+ int state = -1;
+ for (uint32_t s = 0; s < module.states; ++s) if (!strcmp(module.state_names[s], names[k])) state = (int)s;
+ if (state < 0 || app.values[state].num != want[k]) {
+ fprintf(stderr, "%s: %g against %g\n", names[k], state < 0 ? -1 : app.values[state].num, want[k]);
+ return 1;
+ }
+ }
+ double c_runs[7], pure_runs[7];
+ volatile double sink = 0;
+ for (int r = 0; r < 7; ++r) {
+ double start = now_ns();
+ for (int i = 0; i < rounds; ++i) sink += digest(doc, queue).sum;
+ c_runs[r] = (now_ns() - start) / rounds;
+ start = now_ns();
+ for (int i = 0; i < rounds; ++i)
+ if (pure_app_message(&app, (uint32_t)check, NULL, -1, (PureSpan){(const unsigned char *)doc, n}) != PURE_OK) return 1;
+ pure_runs[r] = (now_ns() - start) / rounds;
+ }
+ qsort(c_runs, 7, sizeof(double), by_value);
+ qsort(pure_runs, 7, sizeof(double), by_value);
+ const char *jit = getenv("PURE_JIT"), *batch = getenv("PURE_BATCH");
+ printf("{\"size\":%zu,\"jit\":\"%s\",\"batch\":\"%s\",\"c_ns_per_byte\":%.3f,\"pure_ns_per_byte\":%.3f,\"ratio\":%.1f,"
+ "\"instructions\":%llu,\"instructions_per_byte\":%.1f}\n",
+ n, jit ? jit : "", batch ? batch : "", c_runs[3] / (double)n, pure_runs[3] / (double)n, pure_runs[3] / c_runs[3],
+ (unsigned long long)work, (double)work / (double)n);
+ pure_app_stop(&app);
+ return 0;
+}
generated by cgit v1.2.3 (git 2.46.0) at 2026-10-20 22:59:02 +0000