== sanity test 255a: check 'lfs ladvise -a willread' ===== 21:06:31 (1777424791)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 6.07585 s, 17.3 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-ffff980547c4f800.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 1.8826
Iter 1/10: OSS cache speed: 2.36989
Iter 1/10: ladvise speed: 2.63022
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 2.11536
Iter 2/10: OSS cache speed: 2.603
Iter 2/10: ladvise speed: 2.62159
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 2.4793
Iter 3/10: OSS cache speed: 2.50382
Iter 3/10: ladvise speed: 2.63193
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 2.26085
Iter 4/10: OSS cache speed: 2.48532
Iter 4/10: ladvise speed: 2.69312
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 2.37634
Iter 5/10: OSS cache speed: 2.56617
Iter 5/10: ladvise speed: 2.65841
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 2.2027
Iter 6/10: OSS cache speed: 2.32982
Iter 6/10: ladvise speed: 2.35072
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 2.44009
Iter 7/10: OSS cache speed: 2.72052
Iter 7/10: ladvise speed: 2.6615
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 2.25148
Iter 8/10: OSS cache speed: 2.48146
Iter 8/10: ladvise speed: 2.46031
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 2.19923
Iter 9/10: OSS cache speed: 2.58601
Iter 9/10: ladvise speed: 2.44149
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 2.36334
Iter 10/10: OSS cache speed: 2.58472
Iter 10/10: ladvise speed: 2.54465
Average uncached read: 2.25
Average speedup with OSS cached read:  2.52 = +12%
Average speedup with ladvise willread:  2.56 = +13%
Speedup with OSS cached read less than 20%,  got 12%. Skipping ladvise willread check.
fail_loc=0