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Package: libc6
Version: 2.19, 2.24, 2.28
Severity: normal
--- Please enter the report below this line. ---
Initial condition of the problem representing is a program in the
single source code, built on-and for Debian 7, 8, 9, 10 with a
result in the Live disks.
The program represents a web-interface of several pages, where
here used only the first page.
In building the first page there used wide range of memory
chunks: small objects of the C++ classes (~100 bytes), resources
of the image files (~10 kbytes), GD memory blocks (~1 kbytes), so
on
The live disks were started under VirtualBox 5.2, where the got
data was measured by top.
The data measuring under VirtualBox performed into the next
stages:
1. Start the program and set the initial state, fixing the memory
allocation — measuring the initial memory consumption value
2. Perform the allocation-freeing iteration
2.1. Open the first Web-interface page from a Web-browser of the
host system
2.2. Close the page on the Web-browser
2.3. Wait to close-freeing session of the first Web-interface page
on the program side, 1 minute — measuring the iteration memory
consumption value
3. Return to the stage 2 and repeating 5 iterations
The stage 2.3 tested to real freeing all the allocated memory
blocks both by the objects counters and by valgrind!
In the result we have next data:
| Environment |
Initially, MB |
Iter. 1, MB |
Iter. 2, MB |
Iter. 3, MB |
Iter. 4, MB |
Iter. 5, MB |
Resume |
| Debian 10 amd64, GLibC 2.28, GCC 8.3.0 |
182 |
191.5 |
199 |
206 |
212 |
212 |
Satiated on the iteration 4,
base consumption 9.5 MB, extra consumption 20 MB (200 %),
liboscada.so 3.5 MB, ui_WebVision.so 0.74 MB |
| Debian 9 amd64, GLibC 2.24, GCC 6.3.0 |
160 |
170 |
178 |
179 |
183 |
185 |
Satiated on the iteration 5,
base consumption 10 MB, extra consumption 15 MB (150 %),
liboscada.so 3.5 MB, ui_WebVision.so 0.72 MB |
| Debian 8 amd64, GLibC 2.19, GCC 4.9.2 |
125.5 |
133 |
139 |
139 |
139 |
139 |
Satiated on the iteration 2,
base consumption 7.5 MB, extra consumption 6 MB (80 %),
liboscada.so 3.8 MB, ui_WebVision.so 0.79 MB |
| Debian 7 amd64, GLibC 2.13, GCC 4.7.2 |
101 |
108 |
111 |
112 |
112 |
112 |
Satiated on the iteration 2,
base consumption 7 MB, extra consumption 4 MB (57 %),
liboscada.so 3.4 MB, ui_WebVision.so 0.85 MB |
| Debian 10 i386, GLibC 2.28, GCC 8.3.0 |
151 |
158 |
162.5 |
166 |
166 |
166 |
Satiated on the iteration 3,
base consumption 7 MB, extra consumption 8 MB (114 %),
liboscada.so 3.7 MB, ui_WebVision.so 0.9 MB |
| Debian 9 i386, GLibC 2.24, GCC 6.3.0 |
125 |
131 |
132 |
136 |
136 |
139 |
Satiated on the iteration 5,
base consumption 6 MB, extra consumption 8 MB (133 %),
liboscada.so 3.7 MB, ui_WebVision.so 0.9 MB |
| Debian 8 i386, GLibC 2.19, GCC 4.9.2 |
92.5 |
99 |
101.5 |
103 |
103.5 |
103.5 |
Satiated on the iteration 2,
base consumption 6.5 MB, extra consumption 4.5 (69 %),
liboscada.so 3.6 MB, ui_WebVision.so 0.94 MB |
| Debian 7 i386, GLibC 2.13, GCC 4.7.2 |
70 |
76 |
76 |
76 |
77 |
77 |
Satiated on the iteration 2,
base consumption 6 MB, extra consumption 1 MB (16 %),
liboscada.so 3.6 MB, ui_WebVision.so 0.9 MB |
| ALTLinux 6 i386, GLibC 2.11.3, GCC 4.5.4 |
69 |
74 |
75 |
75 |
75 |
75 |
Satiated on the iteration 2,
base consumption 5 MB, extra consumption 1 MB (20 %),
liboscada.so 2.3 MB, ui_WebVision.so 0.9 MB |
From the data we have the memory
effectivity on AMD64 and I386 platform:
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and the absolute
initial size for the both platform:
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I know about "the Memory Allocation Tunables" (https://www.gnu.org/software/libc/manual/html_node/Memory-Allocation-Tunables.html)
and have tried them but:
- I have not got any effect from environments like to
"GLIBC_TUNABLES=glibc.malloc.trim_threshold=128" on Debian 10
- If the tunables real work, why their do not apply globally (on
the system level) to return the memory effectivity to the level of
the Debian 7 (GLibC 2.13)?
- If the new memory allocator (into GLibC 2.28) is so good, how
can I return its memory effectivity to the level of the Debian 7
(GLibC 2.13)?
The tested program and the analyse page provided on the page http://oscada.org/wiki/Modules/WebVision#Efficiency
--- System information. ---
Architecture:
Kernel: Any for i386, amd64
Debian Release: 8, 9, 10
500 stable-updates ftp.ua.debian.org
500 stable security.debian.org
500 stable ftp.ua.debian.org
--- Package information. ---
Package's Depends field is empty.
Package's Recommends field is empty.
Package's Suggests field is empty.
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