== sanity test 255a: check 'lfs ladvise -a willread' ===== 22:58:00 (1786935480)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 7.53163 s, 13.9 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-ffff92ed19420000.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 1.54169
Iter 1/10: OSS cache speed: 2.20905
Iter 1/10: ladvise speed: 1.71339
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 1.52177
Iter 2/10: OSS cache speed: 1.36801
Iter 2/10: ladvise speed: 1.44423
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 1.55891
Iter 3/10: OSS cache speed: 1.55708
Iter 3/10: ladvise speed: 1.1537
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 1.07896
Iter 4/10: OSS cache speed: 1.36245
Iter 4/10: ladvise speed: 1.33951
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 1.50243
Iter 5/10: OSS cache speed: 1.86824
Iter 5/10: ladvise speed: 2.02409
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 1.64868
Iter 6/10: OSS cache speed: 1.76802
Iter 6/10: ladvise speed: 1.22804
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 1.14905
Iter 7/10: OSS cache speed: 1.20809
Iter 7/10: ladvise speed: 1.30777
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 1.35811
Iter 8/10: OSS cache speed: 1.80119
Iter 8/10: ladvise speed: 2.59363
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 1.24887
Iter 9/10: OSS cache speed: 1.37838
Iter 9/10: ladvise speed: 1.34942
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 1.9862
Iter 10/10: OSS cache speed: 1.79068
Iter 10/10: ladvise speed: 1.4501
Average uncached read: 1.45
Average speedup with OSS cached read:  1.63 = +12%
Average speedup with ladvise willread:  1.56 = +7%
Speedup with OSS cached read less than 20%,  got 12%. Skipping ladvise willread check.
fail_loc=0