== sanity test 255a: check 'lfs ladvise -a willread' ===== 06:11:10 (1789985470)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 6.5465 s, 16.0 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-ffff8c35084b8800.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 2.01802
Iter 1/10: OSS cache speed: 1.44971
Iter 1/10: ladvise speed: 0.981673
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 1.04811
Iter 2/10: OSS cache speed: 1.26098
Iter 2/10: ladvise speed: 1.32303
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.399624
Iter 3/10: OSS cache speed: 0.606679
Iter 3/10: ladvise speed: 0.621627
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.295455
Iter 4/10: OSS cache speed: 0.501505
Iter 4/10: ladvise speed: 0.408059
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.442714
Iter 5/10: OSS cache speed: 0.455808
Iter 5/10: ladvise speed: 0.497801
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.307769
Iter 6/10: OSS cache speed: 0.368908
Iter 6/10: ladvise speed: 0.474358
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.437707
Iter 7/10: OSS cache speed: 0.521045
Iter 7/10: ladvise speed: 0.479307
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.447375
Iter 8/10: OSS cache speed: 0.472438
Iter 8/10: ladvise speed: 0.505195
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.452474
Iter 9/10: OSS cache speed: 0.561619
Iter 9/10: ladvise speed: 0.468056
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.506891
Iter 10/10: OSS cache speed: 0.483388
Iter 10/10: ladvise speed: 0.53328
Average uncached read: .63
Average speedup with OSS cached read:  .66 = +4%
Average speedup with ladvise willread:  .62 = +-1%
Speedup with OSS cached read less than 20%,  got 4%. Skipping ladvise willread check.
fail_loc=0