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//! Collecting memory data using sysinfo.
use sysinfo::System;
use crate::data_collection::memory::MemHarvest;
/// Returns RAM usage.
pub(crate) fn get_ram_usage(sys: &System) -> Option<MemHarvest> {
let mem_used = sys.used_memory();
let mem_total = sys.total_memory();
Some(MemHarvest {
used_bytes: mem_used,
total_bytes: mem_total,
use_percent: if mem_total == 0 {
None
} else {
Some(mem_used as f64 / mem_total as f64 * 100.0)
},
})
}
/// Returns SWAP usage.
pub(crate) fn get_swap_usage(sys: &System) -> Option<MemHarvest> {
let mem_used = sys.used_swap();
let mem_total = sys.total_swap();
Some(MemHarvest {
used_bytes: mem_used,
total_bytes: mem_total,
use_percent: if mem_total == 0 {
None
} else {
Some(mem_used as f64 / mem_total as f64 * 100.0)
},
})
}
/// Returns cache usage. sysinfo has no way to do this directly but it should equal the difference
/// between the available and free memory. Free memory is defined as memory not containing any data,
/// which means cache and buffer memory are not "free". Available memory is defined as memory able
/// to be allocated by processes, which includes cache and buffer memory. On Windows, this will
/// always be 0. For more information, see [docs](https://docs.rs/sysinfo/latest/sysinfo/struct.System.html#method.available_memory)
/// and [memory explanation](https://askubuntu.com/questions/867068/what-is-available-memory-while-using-free-command)
#[cfg(not(target_os = "windows"))]
pub(crate) fn get_cache_usage(sys: &System) -> Option<MemHarvest> {
let mem_used = sys.available_memory().saturating_sub(sys.free_memory());
let mem_total = sys.total_memory();
Some(MemHarvest {
total_bytes: mem_total,
used_bytes: mem_used,
use_percent: if mem_total == 0 {
None
} else {
Some(mem_used as f64 / mem_total as f64 * 100.0)
},
})
}
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