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authorDaniel Baumann <daniel.baumann@progress-linux.org>2018-11-07 12:19:29 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2018-11-07 12:20:17 +0000
commita64a253794ac64cb40befee54db53bde17dd0d49 (patch)
treec1024acc5f6e508814b944d99f112259bb28b1be /libnetdata/storage_number
parentNew upstream version 1.10.0+dfsg (diff)
downloadnetdata-a64a253794ac64cb40befee54db53bde17dd0d49.tar.xz
netdata-a64a253794ac64cb40befee54db53bde17dd0d49.zip
New upstream version 1.11.0+dfsgupstream/1.11.0+dfsg
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'libnetdata/storage_number')
-rw-r--r--libnetdata/storage_number/Makefile.am9
-rw-r--r--libnetdata/storage_number/Makefile.in464
-rw-r--r--libnetdata/storage_number/README.md10
-rw-r--r--libnetdata/storage_number/storage_number.c233
-rw-r--r--libnetdata/storage_number/storage_number.h92
5 files changed, 808 insertions, 0 deletions
diff --git a/libnetdata/storage_number/Makefile.am b/libnetdata/storage_number/Makefile.am
new file mode 100644
index 000000000..1cb69ed99
--- /dev/null
+++ b/libnetdata/storage_number/Makefile.am
@@ -0,0 +1,9 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+
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+
+
+dist_noinst_DATA = \
+ README.md \
+ $(NULL)
diff --git a/libnetdata/storage_number/Makefile.in b/libnetdata/storage_number/Makefile.in
new file mode 100644
index 000000000..1ab5afd87
--- /dev/null
+++ b/libnetdata/storage_number/Makefile.in
@@ -0,0 +1,464 @@
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diff --git a/libnetdata/storage_number/README.md b/libnetdata/storage_number/README.md
new file mode 100644
index 000000000..206c42b87
--- /dev/null
+++ b/libnetdata/storage_number/README.md
@@ -0,0 +1,10 @@
+# netdata storage number
+
+Although `netdata` does all its calculations using `long double`, it stores all values using
+a **custom-made 32-bit number**.
+
+This custom-made number can store in 29 bits values from `-167772150000000.0` to `167772150000000.0`
+with a precision of 0.00001 (yes, it's a floating point number, meaning that higher integer values
+have less decimal precision) and 3 bits for flags.
+
+This provides an extremely optimized memory footprint with just 0.0001% max accuracy loss.
diff --git a/libnetdata/storage_number/storage_number.c b/libnetdata/storage_number/storage_number.c
new file mode 100644
index 000000000..db4cb700b
--- /dev/null
+++ b/libnetdata/storage_number/storage_number.c
@@ -0,0 +1,233 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "../libnetdata.h"
+
+storage_number pack_storage_number(calculated_number value, uint32_t flags)
+{
+ // bit 32 = sign 0:positive, 1:negative
+ // bit 31 = 0:divide, 1:multiply
+ // bit 30, 29, 28 = (multiplier or divider) 0-7 (8 total)
+ // bit 27, 26, 25 flags
+ // bit 24 to bit 1 = the value
+
+ storage_number r = get_storage_number_flags(flags);
+ if(!value) return r;
+
+ int m = 0;
+ calculated_number n = value;
+
+ // if the value is negative
+ // add the sign bit and make it positive
+ if(n < 0) {
+ r += (1 << 31); // the sign bit 32
+ n = -n;
+ }
+
+ // make its integer part fit in 0x00ffffff
+ // by dividing it by 10 up to 7 times
+ // and increasing the multiplier
+ while(m < 7 && n > (calculated_number)0x00ffffff) {
+ n /= 10;
+ m++;
+ }
+
+ if(m) {
+ // the value was too big and we divided it
+ // so we add a multiplier to unpack it
+ r += (1 << 30) + (m << 27); // the multiplier m
+
+ if(n > (calculated_number)0x00ffffff) {
+ #ifdef NETDATA_INTERNAL_CHECKS
+ error("Number " CALCULATED_NUMBER_FORMAT " is too big.", value);
+ #endif
+ r += 0x00ffffff;
+ return r;
+ }
+ }
+ else {
+ // 0x0019999e is the number that can be multiplied
+ // by 10 to give 0x00ffffff
+ // while the value is below 0x0019999e we can
+ // multiply it by 10, up to 7 times, increasing
+ // the multiplier
+ while(m < 7 && n < (calculated_number)0x0019999e) {
+ n *= 10;
+ m++;
+ }
+
+ // the value was small enough and we multiplied it
+ // so we add a divider to unpack it
+ r += (0 << 30) + (m << 27); // the divider m
+ }
+
+#ifdef STORAGE_WITH_MATH
+ // without this there are rounding problems
+ // example: 0.9 becomes 0.89
+ r += lrint((double) n);
+#else
+ r += (storage_number)n;
+#endif
+
+ return r;
+}
+
+calculated_number unpack_storage_number(storage_number value)
+{
+ if(!value) return 0;
+
+ int sign = 0, exp = 0;
+
+ value ^= get_storage_number_flags(value);
+
+ if(value & (1 << 31)) {
+ sign = 1;
+ value ^= 1 << 31;
+ }
+
+ if(value & (1 << 30)) {
+ exp = 1;
+ value ^= 1 << 30;
+ }
+
+ int mul = value >> 27;
+ value ^= mul << 27;
+
+ calculated_number n = value;
+
+ // fprintf(stderr, "UNPACK: %08X, sign = %d, exp = %d, mul = %d, n = " CALCULATED_NUMBER_FORMAT "\n", value, sign, exp, mul, n);
+
+ while(mul > 0) {
+ if(exp) n *= 10;
+ else n /= 10;
+ mul--;
+ }
+
+ if(sign) n = -n;
+ return n;
+}
+
+/*
+int print_calculated_number(char *str, calculated_number value)
+{
+ char *wstr = str;
+
+ int sign = (value < 0) ? 1 : 0;
+ if(sign) value = -value;
+
+#ifdef STORAGE_WITH_MATH
+ // without llrintl() there are rounding problems
+ // for example 0.9 becomes 0.89
+ unsigned long long uvalue = (unsigned long long int) llrintl(value * (calculated_number)100000);
+#else
+ unsigned long long uvalue = value * (calculated_number)100000;
+#endif
+
+ wstr = print_number_llu_r_smart(str, uvalue);
+
+ // make sure we have 6 bytes at least
+ while((wstr - str) < 6) *wstr++ = '0';
+
+ // put the sign back
+ if(sign) *wstr++ = '-';
+
+ // reverse it
+ char *begin = str, *end = --wstr, aux;
+ while (end > begin) aux = *end, *end-- = *begin, *begin++ = aux;
+ // wstr--;
+ // strreverse(str, wstr);
+
+ // remove trailing zeros
+ int decimal = 5;
+ while(decimal > 0 && *wstr == '0') {
+ *wstr-- = '\0';
+ decimal--;
+ }
+
+ // terminate it, one position to the right
+ // to let space for a dot
+ wstr[2] = '\0';
+
+ // make space for the dot
+ int i;
+ for(i = 0; i < decimal ;i++) {
+ wstr[1] = wstr[0];
+ wstr--;
+ }
+
+ // put the dot
+ if(wstr[2] == '\0') { wstr[1] = '\0'; decimal--; }
+ else wstr[1] = '.';
+
+ // return the buffer length
+ return (int) ((wstr - str) + 2 + decimal );
+}
+*/
+
+int print_calculated_number(char *str, calculated_number value) {
+ // info("printing number " CALCULATED_NUMBER_FORMAT, value);
+ char integral_str[50], fractional_str[50];
+
+ char *wstr = str;
+
+ if(unlikely(value < 0)) {
+ *wstr++ = '-';
+ value = -value;
+ }
+
+ calculated_number integral, fractional;
+
+#ifdef STORAGE_WITH_MATH
+ fractional = calculated_number_modf(value, &integral) * 10000000.0;
+#else
+ fractional = ((unsigned long long)(value * 10000000ULL) % 10000000ULL);
+#endif
+
+ unsigned long long integral_int = (unsigned long long)integral;
+ unsigned long long fractional_int = (unsigned long long)calculated_number_llrint(fractional);
+ if(unlikely(fractional_int >= 10000000)) {
+ integral_int += 1;
+ fractional_int -= 10000000;
+ }
+
+ // info("integral " CALCULATED_NUMBER_FORMAT " (%llu), fractional " CALCULATED_NUMBER_FORMAT " (%llu)", integral, integral_int, fractional, fractional_int);
+
+ char *istre;
+ if(unlikely(integral_int == 0)) {
+ integral_str[0] = '0';
+ istre = &integral_str[1];
+ }
+ else
+ // convert the integral part to string (reversed)
+ istre = print_number_llu_r_smart(integral_str, integral_int);
+
+ // copy reversed the integral string
+ istre--;
+ while( istre >= integral_str ) *wstr++ = *istre--;
+
+ if(likely(fractional_int != 0)) {
+ // add a dot
+ *wstr++ = '.';
+
+ // convert the fractional part to string (reversed)
+ char *fstre = print_number_llu_r_smart(fractional_str, fractional_int);
+
+ // prepend zeros to reach 7 digits length
+ int decimal = 7;
+ int len = (int)(fstre - fractional_str);
+ while(len < decimal) {
+ *wstr++ = '0';
+ len++;
+ }
+
+ char *begin = fractional_str;
+ while(begin < fstre && *begin == '0') begin++;
+
+ // copy reversed the fractional string
+ fstre--;
+ while( fstre >= begin ) *wstr++ = *fstre--;
+ }
+
+ *wstr = '\0';
+ // info("printed number '%s'", str);
+ return (int)(wstr - str);
+}
diff --git a/libnetdata/storage_number/storage_number.h b/libnetdata/storage_number/storage_number.h
new file mode 100644
index 000000000..5353ab60b
--- /dev/null
+++ b/libnetdata/storage_number/storage_number.h
@@ -0,0 +1,92 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef NETDATA_STORAGE_NUMBER_H
+#define NETDATA_STORAGE_NUMBER_H 1
+
+#include "../libnetdata.h"
+
+#ifdef NETDATA_WITHOUT_LONG_DOUBLE
+
+#define powl pow
+#define modfl modf
+#define llrintl llrint
+#define roundl round
+#define sqrtl sqrt
+#define copysignl copysign
+#define strtold strtod
+
+typedef double calculated_number;
+#define CALCULATED_NUMBER_FORMAT "%0.7f"
+#define CALCULATED_NUMBER_FORMAT_ZERO "%0.0f"
+#define CALCULATED_NUMBER_FORMAT_AUTO "%f"
+
+#define LONG_DOUBLE_MODIFIER "f"
+typedef double LONG_DOUBLE;
+
+#else
+
+typedef long double calculated_number;
+#define CALCULATED_NUMBER_FORMAT "%0.7Lf"
+#define CALCULATED_NUMBER_FORMAT_ZERO "%0.0Lf"
+#define CALCULATED_NUMBER_FORMAT_AUTO "%Lf"
+
+#define LONG_DOUBLE_MODIFIER "Lf"
+typedef long double LONG_DOUBLE;
+
+#endif
+
+//typedef long long calculated_number;
+//#define CALCULATED_NUMBER_FORMAT "%lld"
+
+typedef long long collected_number;
+#define COLLECTED_NUMBER_FORMAT "%lld"
+
+/*
+typedef long double collected_number;
+#define COLLECTED_NUMBER_FORMAT "%0.7Lf"
+*/
+
+#define calculated_number_modf(x, y) modfl(x, y)
+#define calculated_number_llrint(x) llrintl(x)
+#define calculated_number_round(x) roundl(x)
+#define calculated_number_fabs(x) fabsl(x)
+#define calculated_number_epsilon (calculated_number)0.0000001
+
+#define calculated_number_equal(a, b) (calculated_number_fabs((a) - (b)) < calculated_number_epsilon)
+
+typedef uint32_t storage_number;
+#define STORAGE_NUMBER_FORMAT "%u"
+
+#define SN_NOT_EXISTS (0x0 << 24)
+#define SN_EXISTS (0x1 << 24)
+#define SN_EXISTS_RESET (0x2 << 24)
+#define SN_EXISTS_UNDEF1 (0x3 << 24)
+#define SN_EXISTS_UNDEF2 (0x4 << 24)
+#define SN_EXISTS_UNDEF3 (0x5 << 24)
+#define SN_EXISTS_UNDEF4 (0x6 << 24)
+
+#define SN_FLAGS_MASK (~(0x6 << 24))
+
+// extract the flags
+#define get_storage_number_flags(value) ((((storage_number)(value)) & (1 << 24)) | (((storage_number)(value)) & (2 << 24)) | (((storage_number)(value)) & (4 << 24)))
+#define SN_EMPTY_SLOT 0x00000000
+
+// checks
+#define does_storage_number_exist(value) ((get_storage_number_flags(value) != 0)?1:0)
+#define did_storage_number_reset(value) ((get_storage_number_flags(value) == SN_EXISTS_RESET)?1:0)
+
+storage_number pack_storage_number(calculated_number value, uint32_t flags);
+calculated_number unpack_storage_number(storage_number value);
+
+int print_calculated_number(char *str, calculated_number value);
+
+#define STORAGE_NUMBER_POSITIVE_MAX (167772150000000.0)
+#define STORAGE_NUMBER_POSITIVE_MIN (0.0000001)
+#define STORAGE_NUMBER_NEGATIVE_MAX (-0.0000001)
+#define STORAGE_NUMBER_NEGATIVE_MIN (-167772150000000.0)
+
+// accepted accuracy loss
+#define ACCURACY_LOSS 0.0001
+#define accuracy_loss(t1, t2) (((t1) == (t2) || (t1) == 0.0 || (t2) == 0.0) ? 0.0 : (100.0 - (((t1) > (t2)) ? ((t2) * 100.0 / (t1) ) : ((t1) * 100.0 / (t2)))))
+
+#endif /* NETDATA_STORAGE_NUMBER_H */