== sanity test 255a: check 'lfs ladvise -a willread' ===== 12:27:48 (1744129668)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 2.77068 s, 37.8 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-ffff8800b6ede800.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 2.98712
Iter 1/10: OSS cache speed: 2.39487
Iter 1/10: ladvise speed: 2.68239
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 2.70917
Iter 2/10: OSS cache speed: 3.11099
Iter 2/10: ladvise speed: 3.01768
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 2.86986
Iter 3/10: OSS cache speed: 3.26809
Iter 3/10: ladvise speed: 3.32141
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 3.06526
Iter 4/10: OSS cache speed: 3.30482
Iter 4/10: ladvise speed: 3.4054
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 2.86926
Iter 5/10: OSS cache speed: 2.95891
Iter 5/10: ladvise speed: 3.09776
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 2.71372
Iter 6/10: OSS cache speed: 3.07741
Iter 6/10: ladvise speed: 3.1066
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 2.95315
Iter 7/10: OSS cache speed: 3.20051
Iter 7/10: ladvise speed: 3.15017
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 2.83311
Iter 8/10: OSS cache speed: 3.22342
Iter 8/10: ladvise speed: 3.13732
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 2.89888
Iter 9/10: OSS cache speed: 3.21176
Iter 9/10: ladvise speed: 2.7506
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 2.53631
Iter 10/10: OSS cache speed: 2.94305
Iter 10/10: ladvise speed: 3.05738
Average uncached read: 2.84
Average speedup with OSS cached read:  3.06 = +7%
Average speedup with ladvise willread:  3.07 = +8%
Speedup with OSS cached read less than 20%,  got 7%. Skipping ladvise willread check.
fail_loc=0