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TAPE: Improve attach time tape scan performance

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This commit is contained in:
Mark Pizzolato 2019-04-11 21:01:10 -07:00
parent d12ae2a3f3
commit 0d894613f9
1 changed files with 35 additions and 36 deletions
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17
sim_tape.c
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@ -643,7 +643,9 @@ fprintf (st, " specified file. This record size will be used for
fprintf (st, " possibly the last record which will be what remains unread.\n"); fprintf (st, " possibly the last record which will be what remains unread.\n");
fprintf (st, " The default TAR record size is 10240.\n"); fprintf (st, " The default TAR record size is 10240.\n");
fprintf (st, " -V Display some summary information about the record structure\n"); fprintf (st, " -V Display some summary information about the record structure\n");
fprintf (st, " contained in the tape structure.\n"); fprintf (st, " contained in the tape image scan performed when it is attached.\n");
fprintf (st, " -S Perform reverse reads and forward skips during the attach time\n");
fprintf (st, " tape image scan.\n");
fprintf (st, " -D Causes the internal tape structure information to be displayed\n"); fprintf (st, " -D Causes the internal tape structure information to be displayed\n");
fprintf (st, " while the tape image is scanned.\n"); fprintf (st, " while the tape image is scanned.\n");
return SCPE_OK; return SCPE_OK;
@ -759,6 +761,7 @@ t_tpclnt tpcbc;
t_awshdr awshdr; t_awshdr awshdr;
size_t rdcnt; size_t rdcnt;
t_mtrlnt buffer [256]; /* local tape buffer */ t_mtrlnt buffer [256]; /* local tape buffer */
t_addr saved_pos;
uint32 bufcntr, bufcap; /* buffer counter and capacity */ uint32 bufcntr, bufcap; /* buffer counter and capacity */
int32 runaway_counter, sizeof_gap; /* bytes remaining before runaway and bytes per gap */ int32 runaway_counter, sizeof_gap; /* bytes remaining before runaway and bytes per gap */
t_stat status = MTSE_OK; t_stat status = MTSE_OK;
@ -876,12 +879,7 @@ else switch (f) { /* otherwise the read me
} }
else { /* otherwise it's a record marker */ else { /* otherwise it's a record marker */
if (bufcntr < bufcap /* if the position is within the buffer */ saved_pos = uptr->pos; /* Save data position */
&& sim_fseek (uptr->fileref, uptr->pos, SEEK_SET)) { /* then seek to the data area; if it fails */
status = sim_tape_ioerr (uptr); /* then quit with I/O error status */
break;
}
sbc = MTR_L (*bc); /* extract the record length */ sbc = MTR_L (*bc); /* extract the record length */
uptr->pos = uptr->pos + sizeof (t_mtrlnt) /* position to the start */ uptr->pos = uptr->pos + sizeof (t_mtrlnt) /* position to the start */
+ (f == MTUF_F_STD ? (sbc + 1) & ~1 : sbc); /* of the record */ + (f == MTUF_F_STD ? (sbc + 1) & ~1 : sbc); /* of the record */
@ -893,7 +891,6 @@ else switch (f) { /* otherwise the read me
status = MTSE_RUNAWAY; /* then report it */ status = MTSE_RUNAWAY; /* then report it */
if (status == MTSE_OK) { /* Validate the reverse record size */ if (status == MTSE_OK) { /* Validate the reverse record size */
t_addr saved_pos = (t_addr)sim_ftell(uptr->fileref);
t_mtrlnt rev_lnt; t_mtrlnt rev_lnt;
if (sim_fseek (uptr->fileref, uptr->pos - sizeof (t_mtrlnt), SEEK_SET)){ /* then seek to the end of record size; if it fails */ if (sim_fseek (uptr->fileref, uptr->pos - sizeof (t_mtrlnt), SEEK_SET)){ /* then seek to the end of record size; if it fails */
@ -2983,6 +2980,7 @@ while (r == SCPE_OK) {
++unique_record_sizes; ++unique_record_sizes;
++rec_sizes[bc_f]; ++rec_sizes[bc_f];
} }
if (sim_switches & SWMASK ('S')) {
memset (buf_r, 0, max); memset (buf_r, 0, max);
r_r = sim_tape_rdrecr (uptr, buf_r, &bc_r, max); r_r = sim_tape_rdrecr (uptr, buf_r, &bc_r, max);
pos_r = uptr->pos; pos_r = uptr->pos;
@ -3011,6 +3009,7 @@ while (r == SCPE_OK) {
sim_printf ("Unexpected Space Record Length: %d vs %d\n", bc_s, bc_f); sim_printf ("Unexpected Space Record Length: %d vs %d\n", bc_s, bc_f);
break; break;
} }
}
r = SCPE_OK; r = SCPE_OK;
break; break;
case MTSE_INVRL: /* invalid rec lnt */ case MTSE_INVRL: /* invalid rec lnt */
@ -3041,7 +3040,7 @@ if ((r != MTSE_EOM) || (sim_switches & SWMASK ('V')) ||
sim_printf ("%u bytes of tape data (%u records, %u tapemarks)\n", sim_printf ("%u bytes of tape data (%u records, %u tapemarks)\n",
data_total, record_total, tapemark_total); data_total, record_total, tapemark_total);
if (record_total > 0) { if (record_total > 0) {
sim_printf ("Comprising (in record size order):\n"); sim_printf ("Comprising %d different sized records (in record size order):\n", unique_record_sizes);
for (bc = 0; bc <= max; bc++) { for (bc = 0; bc <= max; bc++) {
if (rec_sizes[bc]) if (rec_sizes[bc])
sim_printf ("%8u %u byte records\n", rec_sizes[bc], (uint32)bc); sim_printf ("%8u %u byte records\n", rec_sizes[bc], (uint32)bc);