improve tip, no root, round up memsize
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<div class="puffies" aria-hidden="true">🐡🐡🐡</div>
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<h2>Shell tips</h2>
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<p>
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To improve performances or avoid disk i/o, one may mount /tmp in memory (mfs). As example to create a /tmp using 10% of available RAM:
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To improve performances or avoid disk i/o, one may mount /tmp in memory (mfs). The new fstab entry would look like this :
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</p>
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<pre> swap /tmp mfs rw,nodev,nosuid,-s=800MB 0 0</pre>
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Of course, replace the size 800MB according to how much memory you want to let for /tmp.
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</p>
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<p> To know how much memory you have, you may use dmesg and awk : </p>
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<pre>dmesg | awk '/avail mem/'</pre>
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<p>
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As example to create a /tmp using 10% of available RAM, the following command will output the line to copy in /etc/fstab to replace "/tmp" entry, using awk to compute the size :
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</p>
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<pre>
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# sed -i '/\/tmp /s/^/\#/' /etc/fstab
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# printf "swap /tmp mfs rw,nodev,nosuid,-s=%sB 0 0\n" \
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$(dmesg |awk '/avail mem/ { print $4 /10 }') \
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>> /etc/fstab
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# chmod 1777 /tmp
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# mount -a
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printf "swap /tmp mfs rw,nodev,nosuid,-s=%sB 0 0\n" \
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$(dmesg |awk '/avail mem/ { print int($4 /10) }')
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</pre>
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<p>You may have to adjust newly created /tmp permissions:</p>
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<pre> # chmod 1777 /tmp</pre>
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</article>
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