== sanity test 255a: check 'lfs ladvise -a willread' ===== 04:27:06 (1786004826)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 12.7337 s, 8.2 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-ffff904e88a2a000.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.433206
Iter 1/10: OSS cache speed: 0.471368
Iter 1/10: ladvise speed: 0.416537
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.401235
Iter 2/10: OSS cache speed: 0.329008
Iter 2/10: ladvise speed: 0.31573
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.268062
Iter 3/10: OSS cache speed: 0.378401
Iter 3/10: ladvise speed: 0.37724
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.310784
Iter 4/10: OSS cache speed: 0.279198
Iter 4/10: ladvise speed: 0.323318
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.344423
Iter 5/10: OSS cache speed: 0.341845
Iter 5/10: ladvise speed: 0.28377
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.311449
Iter 6/10: OSS cache speed: 0.31909
Iter 6/10: ladvise speed: 0.319562
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.320833
Iter 7/10: OSS cache speed: 0.381114
Iter 7/10: ladvise speed: 0.39961
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.413612
Iter 8/10: OSS cache speed: 0.426333
Iter 8/10: ladvise speed: 0.35687
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.371792
Iter 9/10: OSS cache speed: 0.385074
Iter 9/10: ladvise speed: 0.433371
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.395434
Iter 10/10: OSS cache speed: 0.441659
Iter 10/10: ladvise speed: 0.422687
Average uncached read: .35
Average speedup with OSS cached read:  .37 = +5%
Average speedup with ladvise willread:  .36 = +2%
Speedup with OSS cached read less than 20%,  got 5%. Skipping ladvise willread check.
fail_loc=0