== sanity test 255a: check 'lfs ladvise -a willread' ===== 20:55:55 (1784940955)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 14.8092 s, 7.1 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-ffff9e38c6234000.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.322692
Iter 1/10: OSS cache speed: 0.312412
Iter 1/10: ladvise speed: 0.370167
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.286543
Iter 2/10: OSS cache speed: 0.331258
Iter 2/10: ladvise speed: 0.407704
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.36013
Iter 3/10: OSS cache speed: 0.406645
Iter 3/10: ladvise speed: 0.420872
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.39646
Iter 4/10: OSS cache speed: 0.458527
Iter 4/10: ladvise speed: 0.515518
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.46052
Iter 5/10: OSS cache speed: 0.54325
Iter 5/10: ladvise speed: 0.553075
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.490775
Iter 6/10: OSS cache speed: 0.597889
Iter 6/10: ladvise speed: 0.6912
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.576671
Iter 7/10: OSS cache speed: 0.696094
Iter 7/10: ladvise speed: 0.7184
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.615873
Iter 8/10: OSS cache speed: 0.691163
Iter 8/10: ladvise speed: 0.739731
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.604716
Iter 9/10: OSS cache speed: 0.86167
Iter 9/10: ladvise speed: 0.875145
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.258102
Iter 10/10: OSS cache speed: 0.356112
Iter 10/10: ladvise speed: 0.435397
Average uncached read: .43
Average speedup with OSS cached read:  .52 = +20%
Average speedup with ladvise willread:  .57 = +32%
fail_loc=0