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-rw-r--r--experiments/length-RFast-grapheme.csv36
-rw-r--r--experiments/length-RFast-print.csv36
-rw-r--r--experiments/length-RFast-shadow.csv36
-rw-r--r--src/pardes/app.zig26
4 files changed, 132 insertions, 2 deletions
diff --git a/experiments/length-RFast-grapheme.csv b/experiments/length-RFast-grapheme.csv
new file mode 100644
index 0000000..12c8e0e
--- /dev/null
+++ b/experiments/length-RFast-grapheme.csv
@@ -0,0 +1,36 @@
+label,experiment,cols,rows,length,op,rep,rtt_us,settle_us,bytes
+RFast-grapheme,length,0,0,0,insert,0,14885,26233,141
+RFast-grapheme,length,0,0,0,insert,1,14545,20706,80
+RFast-grapheme,length,0,0,0,insert,2,14520,20768,81
+RFast-grapheme,length,0,0,0,insert,3,14539,20675,81
+RFast-grapheme,length,0,0,0,insert,4,14594,20703,81
+RFast-grapheme,length,0,0,0,insert,5,14554,20713,81
+RFast-grapheme,length,0,0,0,insert,6,14611,20738,81
+RFast-grapheme,length,0,0,20,insert,0,14772,21040,81
+RFast-grapheme,length,0,0,20,insert,1,14776,20862,81
+RFast-grapheme,length,0,0,20,insert,2,14709,20938,81
+RFast-grapheme,length,0,0,20,insert,3,14786,20883,81
+RFast-grapheme,length,0,0,20,insert,4,14735,20885,81
+RFast-grapheme,length,0,0,20,insert,5,14865,27951,158
+RFast-grapheme,length,0,0,20,insert,6,14920,20918,80
+RFast-grapheme,length,0,0,40,insert,0,15008,21111,81
+RFast-grapheme,length,0,0,40,insert,1,15018,21143,81
+RFast-grapheme,length,0,0,40,insert,2,15129,21231,81
+RFast-grapheme,length,0,0,40,insert,3,15023,21256,81
+RFast-grapheme,length,0,0,40,insert,4,14965,21150,81
+RFast-grapheme,length,0,0,40,insert,5,15110,21194,81
+RFast-grapheme,length,0,0,40,insert,6,15037,21346,81
+RFast-grapheme,length,0,0,80,insert,0,15558,21725,81
+RFast-grapheme,length,0,0,80,insert,1,15511,21697,81
+RFast-grapheme,length,0,0,80,insert,2,15613,21890,81
+RFast-grapheme,length,0,0,80,insert,3,15580,21874,81
+RFast-grapheme,length,0,0,80,insert,4,15605,21927,81
+RFast-grapheme,length,0,0,80,insert,5,15624,21902,81
+RFast-grapheme,length,0,0,80,insert,6,15540,21793,81
+RFast-grapheme,length,0,0,160,insert,0,16421,22567,81
+RFast-grapheme,length,0,0,160,insert,1,16457,22606,81
+RFast-grapheme,length,0,0,160,insert,2,16391,22541,81
+RFast-grapheme,length,0,0,160,insert,3,16469,22654,81
+RFast-grapheme,length,0,0,160,insert,4,16553,29393,158
+RFast-grapheme,length,0,0,160,insert,5,16451,22687,80
+RFast-grapheme,length,0,0,160,insert,6,16507,22778,81
diff --git a/experiments/length-RFast-print.csv b/experiments/length-RFast-print.csv
new file mode 100644
index 0000000..359eb6c
--- /dev/null
+++ b/experiments/length-RFast-print.csv
@@ -0,0 +1,36 @@
+label,experiment,cols,rows,length,op,rep,rtt_us,settle_us,bytes
+RFast-print,length,0,0,0,insert,0,14526,25906,141
+RFast-print,length,0,0,0,insert,1,14274,20447,80
+RFast-print,length,0,0,0,insert,2,14333,20546,81
+RFast-print,length,0,0,0,insert,3,14255,20485,81
+RFast-print,length,0,0,0,insert,4,14263,20366,81
+RFast-print,length,0,0,0,insert,5,14229,20380,81
+RFast-print,length,0,0,0,insert,6,14426,20565,81
+RFast-print,length,0,0,20,insert,0,14343,20423,81
+RFast-print,length,0,0,20,insert,1,14435,20550,81
+RFast-print,length,0,0,20,insert,2,14356,20550,81
+RFast-print,length,0,0,20,insert,3,14388,20571,81
+RFast-print,length,0,0,20,insert,4,14325,20626,81
+RFast-print,length,0,0,20,insert,5,14536,27423,158
+RFast-print,length,0,0,20,insert,6,14491,20566,80
+RFast-print,length,0,0,40,insert,0,14460,20702,81
+RFast-print,length,0,0,40,insert,1,14572,20704,81
+RFast-print,length,0,0,40,insert,2,14655,20612,81
+RFast-print,length,0,0,40,insert,3,14511,20822,81
+RFast-print,length,0,0,40,insert,4,14529,20675,81
+RFast-print,length,0,0,40,insert,5,14663,20789,81
+RFast-print,length,0,0,40,insert,6,14555,20622,81
+RFast-print,length,0,0,80,insert,0,14909,21146,81
+RFast-print,length,0,0,80,insert,1,14925,21127,81
+RFast-print,length,0,0,80,insert,2,14850,20923,81
+RFast-print,length,0,0,80,insert,3,14827,21071,81
+RFast-print,length,0,0,80,insert,4,14835,21038,81
+RFast-print,length,0,0,80,insert,5,14909,21055,81
+RFast-print,length,0,0,80,insert,6,14846,21019,81
+RFast-print,length,0,0,160,insert,0,15474,21442,81
+RFast-print,length,0,0,160,insert,1,15334,21479,81
+RFast-print,length,0,0,160,insert,2,15319,21576,81
+RFast-print,length,0,0,160,insert,3,15333,21564,81
+RFast-print,length,0,0,160,insert,4,15521,28310,158
+RFast-print,length,0,0,160,insert,5,15424,21569,80
+RFast-print,length,0,0,160,insert,6,15364,21520,81
diff --git a/experiments/length-RFast-shadow.csv b/experiments/length-RFast-shadow.csv
new file mode 100644
index 0000000..280f32b
--- /dev/null
+++ b/experiments/length-RFast-shadow.csv
@@ -0,0 +1,36 @@
+label,experiment,cols,rows,length,op,rep,rtt_us,settle_us,bytes
+RFast-shadow,length,0,0,0,insert,0,9358,20630,141
+RFast-shadow,length,0,0,0,insert,1,8889,14840,80
+RFast-shadow,length,0,0,0,insert,2,8854,14972,81
+RFast-shadow,length,0,0,0,insert,3,8812,14915,81
+RFast-shadow,length,0,0,0,insert,4,8835,15076,81
+RFast-shadow,length,0,0,0,insert,5,8939,15056,81
+RFast-shadow,length,0,0,0,insert,6,9017,15114,81
+RFast-shadow,length,0,0,20,insert,0,8914,15153,81
+RFast-shadow,length,0,0,20,insert,1,8982,15181,81
+RFast-shadow,length,0,0,20,insert,2,8968,15200,81
+RFast-shadow,length,0,0,20,insert,3,8913,15315,81
+RFast-shadow,length,0,0,20,insert,4,8967,15203,81
+RFast-shadow,length,0,0,20,insert,5,9172,22033,158
+RFast-shadow,length,0,0,20,insert,6,9074,15112,80
+RFast-shadow,length,0,0,40,insert,0,9137,15276,81
+RFast-shadow,length,0,0,40,insert,1,9134,15288,81
+RFast-shadow,length,0,0,40,insert,2,9180,15368,81
+RFast-shadow,length,0,0,40,insert,3,9176,15398,81
+RFast-shadow,length,0,0,40,insert,4,9171,15214,81
+RFast-shadow,length,0,0,40,insert,5,9236,15299,81
+RFast-shadow,length,0,0,40,insert,6,9280,15378,81
+RFast-shadow,length,0,0,80,insert,0,9496,15693,81
+RFast-shadow,length,0,0,80,insert,1,9492,15601,81
+RFast-shadow,length,0,0,80,insert,2,9463,15571,81
+RFast-shadow,length,0,0,80,insert,3,9527,15734,81
+RFast-shadow,length,0,0,80,insert,4,9487,15662,81
+RFast-shadow,length,0,0,80,insert,5,9483,15633,81
+RFast-shadow,length,0,0,80,insert,6,9508,15636,81
+RFast-shadow,length,0,0,160,insert,0,9982,16123,81
+RFast-shadow,length,0,0,160,insert,1,10180,16184,81
+RFast-shadow,length,0,0,160,insert,2,10023,16239,81
+RFast-shadow,length,0,0,160,insert,3,9989,16163,81
+RFast-shadow,length,0,0,160,insert,4,10161,23035,158
+RFast-shadow,length,0,0,160,insert,5,10022,16060,80
+RFast-shadow,length,0,0,160,insert,6,10178,16294,81
diff --git a/src/pardes/app.zig b/src/pardes/app.zig
index 23da203..2f13865 100644
--- a/src/pardes/app.zig
+++ b/src/pardes/app.zig
@@ -101,6 +101,11 @@ extern fn pardes_p4_wants_frame() callconv(.c) bool;
/// Has the user asked to leave? There is nowhere to go, so this only stops the loop.
extern fn pardes_p4_quit() callconv(.c) bool;
+/// The last frame's three stages in CPU cycles: the copy of pardes's Surface into vaxis's grid,
+/// vaxis's own diff-and-emit, and the push into the UART. Only meaningful under `-Dprof`; the
+/// editor object always exports it, and it costs two CSR reads per stage.
+extern fn pardes_p4_frame_prof(copy: *u64, render: *u64, flush: *u64) callconv(.c) void;
+
// ------------------------------------------------------------------------------------ the sink
/// The write callback handed to `pardes_p4_init`. No context is needed - there is one UART.
@@ -230,11 +235,28 @@ export fn zig_main() noreturn {
if (err != 0) soc.rom.print("MARK PARDES_RENDER_FAIL rc=%u\r\n", .{err});
if (prof) {
const render_cy = soc.cycles() - t0;
+ // A SECOND render with nothing changed since the first. It splits the cost in two:
+ // whatever this still costs is the price of walking and diffing the whole editor
+ // state, paid regardless of output, while the difference between the two is the
+ // price of the change itself. `wants_frame` is false now, so this only happens
+ // under -Dprof and never on a shipping build.
+ const t1 = soc.cycles();
+ _ = pardes_p4_render();
+ const idle_cy = soc.cycles() - t1;
// Reported in cycles, not microseconds: the divisor is the CPU clock, which this
// firmware does not set and has only ever measured, so converting here would bake a
// guess into the data. `experiments/` divides by the clock it measured.
- soc.rom.print("PROF in=%u render=%u\r\n", .{
- @as(u32, @intCast(input_cy)), @as(u32, @intCast(render_cy)),
+ var copy_cy: u64 = 0;
+ var vx_cy: u64 = 0;
+ var flush_cy: u64 = 0;
+ pardes_p4_frame_prof(&copy_cy, &vx_cy, &flush_cy);
+ soc.rom.print("PROF in=%u render=%u idle=%u copy=%u vaxis=%u flush=%u\r\n", .{
+ @as(u32, @intCast(input_cy)),
+ @as(u32, @intCast(render_cy)),
+ @as(u32, @intCast(idle_cy)),
+ @as(u32, @intCast(copy_cy)),
+ @as(u32, @intCast(vx_cy)),
+ @as(u32, @intCast(flush_cy)),
});
}
}
generated by cgit v1.3 (git 2.53.0) at 2026-10-02 05:31:13 +0000