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xz: Add comments.
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@ -581,6 +581,13 @@ coder_set_compression_settings(void)
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if (memory_usage <= memory_limit) {
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if (memory_usage <= memory_limit) {
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// The memory usage is now low enough.
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// The memory usage is now low enough.
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//
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// Since 5.6.1: This is only shown at
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// V_DEBUG instead of V_WARNING because
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// changing the number of threads doesn't
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// affect the output. On some systems this
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// message would be too common now that
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// multithreaded compression is the default.
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message(V_DEBUG, _("Reduced the number of "
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message(V_DEBUG, _("Reduced the number of "
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"threads from %s to %s to not exceed "
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"threads from %s to %s to not exceed "
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"the memory usage limit of %s MiB"),
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"the memory usage limit of %s MiB"),
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@ -600,6 +607,9 @@ coder_set_compression_settings(void)
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// way -T0 won't use insane amount of memory but at the same
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// way -T0 won't use insane amount of memory but at the same
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// time the soft limit will never make xz fail and never make
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// time the soft limit will never make xz fail and never make
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// xz change settings that would affect the compressed output.
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// xz change settings that would affect the compressed output.
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//
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// Since 5.6.1: Like above, this is now shown at V_DEBUG
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// instead of V_WARNING.
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if (hardware_memlimit_mtenc_is_default()) {
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if (hardware_memlimit_mtenc_is_default()) {
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message(V_DEBUG, _("Reduced the number of threads "
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message(V_DEBUG, _("Reduced the number of threads "
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"from %s to one. The automatic memory usage "
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"from %s to one. The automatic memory usage "
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