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change the cache size calculation for auto cache size (-1) to be smaller, especially for machines with large amounts of RAM

This commit is contained in:
arvidn 2016-03-06 01:42:46 -05:00
parent adf56344e6
commit b40430f175
1 changed files with 28 additions and 2 deletions
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30
src/disk_buffer_pool.cpp
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@ -481,9 +481,35 @@ namespace libtorrent
int const cache_size = sett.get_int(settings_pack::cache_size); int const cache_size = sett.get_int(settings_pack::cache_size);
if (cache_size < 0) if (cache_size < 0)
{ {
boost::uint64_t const phys_ram = total_physical_ram(); boost::uint64_t phys_ram = total_physical_ram();
if (phys_ram == 0) m_max_use = 1024; if (phys_ram == 0) m_max_use = 1024;
else m_max_use = phys_ram / 8 / m_block_size; else
{
// this is the logic to calculate the automatic disk cache size
// based on the amount of physical RAM.
// The more physical RAM, the smaller portion of it is allocated
// for the cache.
// we take a 30th of everything exceeding 4 GiB
// a 20th of everything exceeding 1 GiB
// and a 10th of everything below a GiB
boost::int64_t const gb = 1024 * 1024 * 1024;
boost::int64_t result = 0;
if (phys_ram > 4 * gb)
{
result += (phys_ram - 4 * gb) / 30;
phys_ram = 4 * gb;
}
if (phys_ram > 1 * gb)
{
result += (phys_ram - 1 * gb) / 20;
phys_ram = 1 * gb;
}
result += phys_ram / 10;
m_max_use = result / m_block_size;
}
if (sizeof(void*) == 4) if (sizeof(void*) == 4)
{ {