== sanity test 255a: check 'lfs ladvise -a willread' ===== 10:21:12 (1786630872)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 15.6813 s, 6.7 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-ffff8e8807892000.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.402774
Iter 1/10: OSS cache speed: 0.352141
Iter 1/10: ladvise speed: 0.403834
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.32887
Iter 2/10: OSS cache speed: 0.340405
Iter 2/10: ladvise speed: 0.290509
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.309953
Iter 3/10: OSS cache speed: 0.334576
Iter 3/10: ladvise speed: 0.377189
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.33001
Iter 4/10: OSS cache speed: 0.343001
Iter 4/10: ladvise speed: 0.404699
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.366738
Iter 5/10: OSS cache speed: 0.329361
Iter 5/10: ladvise speed: 0.401536
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.313871
Iter 6/10: OSS cache speed: 0.348108
Iter 6/10: ladvise speed: 0.411679
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.33364
Iter 7/10: OSS cache speed: 0.317094
Iter 7/10: ladvise speed: 0.366227
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.345435
Iter 8/10: OSS cache speed: 0.400165
Iter 8/10: ladvise speed: 0.36532
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.355354
Iter 9/10: OSS cache speed: 0.354233
Iter 9/10: ladvise speed: 0.338522
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.336702
Iter 10/10: OSS cache speed: 0.458106
Iter 10/10: ladvise speed: 0.401429
Average uncached read: .34
Average speedup with OSS cached read:  .35 = +2%
Average speedup with ladvise willread:  .37 = +8%
Speedup with OSS cached read less than 20%,  got 2%. Skipping ladvise willread check.
fail_loc=0