1mpss.so.1(1) User Commands mpss.so.1(1)
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6 mpss.so.1 - shared object for setting preferred page size
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9 mpss.so.1
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13 The mpss.so.1 shared object provides a means by which the preferred
14 stack and/or heap page size can be selectively configured for launched
15 processes and their descendants. To enable mpss.so.1, the following
16 string needs to be present in the environment (see ld.so.1(1)) along
17 with one or more MPSS (Multiple Page Size Support) environment vari‐
18 ables:
19 LD_PRELOAD=$LD_PRELOAD:mpss.so.1
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25 Once preloaded, the mpss.so.1 shared object reads the following envi‐
26 ronment variables to determine any preferred page size requirements and
27 any processes these may be specific to.
28 MPSSHEAP=size MPSSHEAP and MPSSSTACK specify the preferred
30 MPSSSTACK=size page sizes for the heap and stack, respec‐
31 tively. The specified page size(s) are
32 applied to all created processes.
33 size must be a supported page size (see
35 pagesize(1)) or 0, in which case the system
36 will select an appropriate page size (see
37 memcntl(2)).
38 size can be qualified with K, M, G, or T to
40 specify Kilobytes, Megabytes, Gigabytes, or
41 Terabytes respectively.
42 MPSSCFGFILE=config-file config-file is a text file which contains
45 one or more mpss configuration entries of
46 the form:
47 exec-name exec-args:heap-size:stack-size
49 exec-name specifies the name of an applica‐
52 tion or executable. The corresponding pre‐
53 ferred page size(s) are set for newly cre‐
54 ated processes (see getexecname(3C)) that
55 match the first exec-name found in the file.
56 exec-name can be a full pathname, a base
58 name or a pattern string. See File Name Gen‐
59 eration in sh(1) for a discussion of pattern
60 matching.
61 exec-args is an optionally specified pattern
63 string to match against arguments. Preferred
64 page size(s) are set only if exec-args is
65 not specified or occurs within the arguments
66 to exec-name.
67 If heap-size and/or stack-size are not spec‐
69 ified, the corresponding preferred page
70 size(s) will not be set.
71 MPSSCFGFILE takes precedence over MPSSHEAP
73 and MPSSSTACK. When MPSSCFGFILE is not set,
74 preferred page size settings are taken from
75 file /etc/mpss.conf if it exists.
76 MPSSERRFILE=pathname By default, error messages are logged via
79 syslog(3C) using level LOG_ERR and facility
80 LOG_USER. If MPSSERRFILE contains a valid
81 pathname (such as /dev/stderr), error mes‐
82 sages will be logged there instead.
83
86 Example 1 Configuring preferred page sizes using MPSSCFGFILE
87 The following Bourne shell commands (see sh(1)) configure the preferred
90 page sizes to a select set of applications with exec names that begin
91 with foo, using the MPSSCFGFILE environment variable. The MPSS configu‐
92 ration file, mpsscfg, is assumed to have been previously created via a
93 text editor like vi(1). The cat(1) command is only dumping out the con‐
94 tents.
95 example$ LD_PRELOAD=$LD_PRELOAD:mpss.so.1
98 example$ MPSSCFGFILE=mpsscfg
99 example$ export LD_PRELOAD MPSSCFGFILE
100 example$ cat $MPSSCFGFILE
101 foo*:512K:64K
102 Once the application has been started, pmap (see proc(1)) can be used
107 to view the actual page sizes configured:
108 example$ foobar &
111 example$ pmap -s `pgrep foobar`
112 If the desired page size is not configured (shown in the pmap output),
117 it may be due to errors in the MPSS configuration file or environment
118 variables. Check the error log (by default: /var/adm/messages) for
119 errors.
120 If no errors can be found, resource or alignment constraints may be
124 responsible. See the NOTES section.
125 Example 2 Configuring preferred page sizes using MPSSHEAP and MPSSSTACK
128 The following Bourne shell commands configure 512K heap and 64K stack
131 preferred page sizes for all applications using the MPSSHEAP and
132 MPSSSTACK environment variables.
133 example$ LD_PRELOAD=$LD_PRELOAD:mpss.so.1
136 example$ MPSSHEAP=512K
137 example$ MPSSSTACK=64K
138 example$ export LD_PRELOAD MPSSHEAP MPSSSTACK
139 Example 3 Precedence rules (continuation from Example 2)
143 The preferred page size configuration in MPSSCFGFILE overrides MPSSHEAP
146 and MPSSTACK. Appending the following commands to those in Example 2
147 would mean that all applications will be configured with 512K heap and
148 64K stack preferred page sizes with the exception of those applica‐
149 tions, the ls command, and all applications beginning with ora that
150 have ora1 as an argument, in the configuration file.
151 example$ MPSSCFGFILE=mpsscfg2
154 example$ export MPSSCFGFILE
155 example$ cat $MPSSCFGFILE
156 ls::
157 ora* ora1:4m:4m
158
162 /usr/lib/ld/map.bssalign A template link-editor mapfile for align‐
163 ing bss (see NOTES).
164 /etc/mpss.conf Configuration file
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170 See attributes(5) for descriptions of the following attributes:
171 ┌─────────────────────────────┬─────────────────────────────┐
176 │ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
177 ├─────────────────────────────┼─────────────────────────────┤
178 │Availability │SUNWesu (32-bit) │
179 ├─────────────────────────────┼─────────────────────────────┤
180 │ │SUNWesxu (64-bit) │
181 ├─────────────────────────────┼─────────────────────────────┤
182 │Interface Stability │Evolving │
183 └─────────────────────────────┴─────────────────────────────┘
184
186 cat(1), ld(1), ld.so.1(1), pagesize(1), ppgsz(1), proc(1), sh(1),
187 vi(1), exec(2), fork(2), memcntl(2), getexecname(3C), getpagesize(3C),
188 syslog(3C), proc(4), attributes(5)
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191 The heap and stack preferred page sizes are inherited. A child process
192 has the same preferred page sizes as its parent. On exec(2), the pre‐
193 ferred page sizes are set back to the default system page size unless a
194 preferred page size has been configured via the mpss shared object.
195 ppgsz(1), a proc tool, can also be used to set the preferred stack
198 and/or heap page sizes. It cannot selectively configure the page size
199 for descendents based on name matches.
200 See also NOTES under ppgsz(1).
203SunOS 5.11 20 Feb 2002 mpss.so.1(1)