== sanity test 255a: check 'lfs ladvise -a willread' ===== 21:18:43 (1786670323)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 14.8767 s, 7.0 MB/s
ladvise: range [2, 1] is invalid
Provide servers with advice about access patterns for a file.
usage: ladvise [--advice|-a ADVICE] [--start|-s START[kMGT]]
               [--background|-b] [--unset|-u]

               {--end|-e END[kMGT]|--length|-l LENGTH[kMGT]}
               {[--mode|-m [READ,WRITE]}
               <file> ...

ladvise: range [2, 2] is invalid
Provide servers with advice about access patterns for a file.
usage: ladvise [--advice|-a ADVICE] [--start|-s START[kMGT]]
               [--background|-b] [--unset|-u]

               {--end|-e END[kMGT]|--length|-l LENGTH[kMGT]}
               {[--mode|-m [READ,WRITE]}
               <file> ...

ladvise: conflicting arguments of -l and -e
Provide servers with advice about access patterns for a file.
usage: ladvise [--advice|-a ADVICE] [--start|-s START[kMGT]]
               [--background|-b] [--unset|-u]

               {--end|-e END[kMGT]|--length|-l LENGTH[kMGT]}
               {[--mode|-m [READ,WRITE]}
               <file> ...

Synchronous ladvise should wait
fail_val=8
fail_loc=0x237
Asynchronous ladvise shouldn't wait
llite.lustre-ffff9267c878f000.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.329815
Iter 1/10: OSS cache speed: 0.344661
Iter 1/10: ladvise speed: 0.357407
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.312456
Iter 2/10: OSS cache speed: 0.400009
Iter 2/10: ladvise speed: 0.336967
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.341811
Iter 3/10: OSS cache speed: 0.394761
Iter 3/10: ladvise speed: 0.34126
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.23342
Iter 4/10: OSS cache speed: 0.336118
Iter 4/10: ladvise speed: 0.314691
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.318417
Iter 5/10: OSS cache speed: 0.314029
Iter 5/10: ladvise speed: 0.242455
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.302563
Iter 6/10: OSS cache speed: 0.318995
Iter 6/10: ladvise speed: 0.315026
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.280172
Iter 7/10: OSS cache speed: 0.304228
Iter 7/10: ladvise speed: 0.25866
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.233395
Iter 8/10: OSS cache speed: 0.278658
Iter 8/10: ladvise speed: 0.327161
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.28657
Iter 9/10: OSS cache speed: 0.291604
Iter 9/10: ladvise speed: 0.27704
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.273035
Iter 10/10: OSS cache speed: 0.285154
Iter 10/10: ladvise speed: 0.304495
Average uncached read: .29
Average speedup with OSS cached read:  .32 = +10%
Average speedup with ladvise willread:  .30 = +3%
Speedup with OSS cached read less than 20%,  got 10%. Skipping ladvise willread check.
fail_loc=0