43 lines
1.8 KiB
Rust
43 lines
1.8 KiB
Rust
use nix::sys::resource::{getrlimit, setrlimit, Resource};
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use nix::sys::resource::{getrusage, UsageWho};
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/// Tests the RLIMIT_NOFILE functionality of getrlimit(), where the resource RLIMIT_NOFILE refers
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/// to the maximum file descriptor number that can be opened by the process (aka the maximum number
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/// of file descriptors that the process can open, since Linux 4.5).
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///
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/// We first fetch the existing file descriptor maximum values using getrlimit(), then edit the
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/// soft limit to make sure it has a new and distinct value to the hard limit. We then setrlimit()
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/// to put the new soft limit in effect, and then getrlimit() once more to ensure the limits have
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/// been updated.
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#[test]
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pub fn test_resource_limits_nofile() {
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let (mut soft_limit, hard_limit) =
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getrlimit(Resource::RLIMIT_NOFILE).unwrap();
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soft_limit -= 1;
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assert_ne!(soft_limit, hard_limit);
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setrlimit(Resource::RLIMIT_NOFILE, soft_limit, hard_limit).unwrap();
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let (new_soft_limit, _) = getrlimit(Resource::RLIMIT_NOFILE).unwrap();
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assert_eq!(new_soft_limit, soft_limit);
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}
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#[test]
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pub fn test_self_cpu_time() {
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// Make sure some CPU time is used.
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let mut numbers: Vec<i32> = (1..1_000_000).collect();
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numbers.iter_mut().for_each(|item| *item *= 2);
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// FIXME: this is here to help ensure the compiler does not optimize the whole
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// thing away. Replace the assert with test::black_box once stabilized.
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assert_eq!(numbers[100..200].iter().sum::<i32>(), 30_100);
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let usage = getrusage(UsageWho::RUSAGE_SELF)
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.expect("Failed to call getrusage for SELF");
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let rusage = usage.as_ref();
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let user = usage.user_time();
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assert!(user.tv_sec() > 0 || user.tv_usec() > 0);
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assert_eq!(user.tv_sec(), rusage.ru_utime.tv_sec);
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assert_eq!(user.tv_usec(), rusage.ru_utime.tv_usec);
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}
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