== sanity test 255a: check 'lfs ladvise -a willread' ===== 14:25:25 (1767727525)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 8.31119 s, 12.6 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-ffff913be2253800.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.643252
Iter 1/10: OSS cache speed: 0.734623
Iter 1/10: ladvise speed: 0.868431
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.682282
Iter 2/10: OSS cache speed: 0.874219
Iter 2/10: ladvise speed: 0.891051
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.731923
Iter 3/10: OSS cache speed: 0.818755
Iter 3/10: ladvise speed: 0.808568
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.767225
Iter 4/10: OSS cache speed: 0.863217
Iter 4/10: ladvise speed: 0.957588
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.72037
Iter 5/10: OSS cache speed: 0.831055
Iter 5/10: ladvise speed: 0.830155
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.82178
Iter 6/10: OSS cache speed: 0.886216
Iter 6/10: ladvise speed: 1.02716
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.891311
Iter 7/10: OSS cache speed: 1.04084
Iter 7/10: ladvise speed: 0.912753
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.91084
Iter 8/10: OSS cache speed: 1.30351
Iter 8/10: ladvise speed: 1.05155
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 1.04588
Iter 9/10: OSS cache speed: 1.11841
Iter 9/10: ladvise speed: 2.01385
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 1.75381
Iter 10/10: OSS cache speed: 1.98978
Iter 10/10: ladvise speed: 2.13895
Average uncached read: .89
Average speedup with OSS cached read:  1.04 = +16%
Average speedup with ladvise willread:  1.15 = +29%
Speedup with OSS cached read less than 20%,  got 16%. Skipping ladvise willread check.
fail_loc=0