[OSX] use host_statistics64 to get memory metrics
#2502
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Signed-off-by: Giampaolo Rodola <g.rodola@gmail.com>
Signed-off-by: Giampaolo Rodola <g.rodola@gmail.com>
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We have lots of sporadic failures on OSX related to
freevirtual_memory(), whose value does not exactly matchvm_statCLI utility. With this PR we use the exact same approach ofvm_statCLI tool, whose source code is here:https://github.com/apple-open-source/macos/blob/master/system_cmds/vm_stat/vm_stat.c
Hopefully this will reduce such sporadic failures.