Cache for gzipped elevation tiles #3120

molind · 2021-06-01T13:07:35Z

Issue

As discussed in #3071 current implementation don't work correctly with gzipped elevation tiles. This is basic implementation of cache with parallel tile decoding support. I've used unpacked tile limit = 50. But it could be tuned from config or any other way you want.

Please review and let me know what should I improve.

kevinkreiser · 2021-06-01T22:44:29Z

valhalla/skadi/sample.h


  // using memory maps
-  mutable std::vector<std::pair<format_t, midgard::mem_map<char>>> mapped_cache;


so this is the main question to me. completely removing memory mapping will have some performance impact. i dont care as much about peformance impact for offline processing like that we have in valhalla_build_tiles but when we run the service and someone does a /height request it needs to be super fast (as it was before). with a naive caching scheme we will not be able to beat what the OS is doing with memory mapping but we'd have to test it to find out.

indeed i know that memory mapping many small files can be slower than just reading them from disk and in that scenario its faster to have an in memory cache like we do for graph tiles but there we are talking about 10s of kilobytes and here we are talking about tiles that are 25 megabytes in size. anyway we need to consider how this change affects the service. it could be for the better (ie we load up the 300GB of compressed elevation data and now its fast enough to be usable but still not need a 1.6TB disk). i just know from 3 years ago when i implemented lz4 it ended up not being fast enough performance wise though i will say i dont remember what my caching looked like (though i guess git history would tell us).

EDIT: i see memory mapping still exists as before but in a different section. ill take a closer look at the code in the coming days

anyway im going start downloading the elevation locally so i can try out all the different configurations. i do think i could test the compressed data on one of my nvme drives but for the other test configurations i'll need to use my raided sata disks. please dont be discouraged if it takes a while to get this merged in, testing properly will take a while!

…, otherwise cache_item_t won't load it.

molind · 2021-06-02T09:03:20Z

It runs right the same way as earlier version. mapped_cache is now called just cache.

valhalla/valhalla/skadi/sample.h

Line 137 in 191760c

std::vector<cache_item_t> cache;

To store all required information cache_item_t was added.

valhalla/valhalla/skadi/sample.h

Lines 97 to 134 in 191760c

    
           class cache_item_t { 
        
           private: 
        
             format_t format; 
        
             midgard::mem_map<char> data; 
        
             int usages; 
        
             const char* unpacked; 
        
           public: 
        
             cache_item_t() : format(format_t::UNKNOWN), usages(0), unpacked(nullptr) { 
        
             } 
        
             cache_item_t(cache_item_t&&) = default; 
        
             ~cache_item_t() { 
        
               free((void*)unpacked); 
        
             } 
        
             bool init(const std::string& file, format_t format); 
        
             inline const char* get_data() const { 
        
               return data.get(); 
        
             } 
        
             inline format_t get_format() const { 
        
               return format; 
        
             } 
        
             inline int& get_usages() { 
        
               return usages; 
        
             } 
        
             inline const char* get_unpacked() { 
        
               return unpacked; 
        
             } 
        
             inline const char* detach_unpacked() { 
        
               auto rv = unpacked; 
        
               unpacked = nullptr; 
        
               return rv; 
        
             } 
        
             bool unpack(const char* unpacked); 
        
             static boost::optional<std::pair<uint16_t, sample::format_t>> 
        
             parse_hgt_name(const std::string& name); 
        
           };

I've tried to keep workflow identical to current one without any useless thread synchronisation when all data stored in RAW files. cache filled in sample constructor.

valhalla/src/skadi/sample.cc

Lines 218 to 228 in 191760c

    
             auto files = get_files(data_source); 
        
             for (const auto& f : files) { 
        
               // make sure its a valid index 
        
               auto data = cache_item_t::parse_hgt_name(f); 
        
               if (data && data->second != format_t::UNKNOWN) { 
        
                 if (!cache[data->first].init(f, data->second)) { 
        
                   LOG_WARN("Corrupt elevation data: " + f); 
        
                 } 
        
               } 
        
             } 
        
           }

And cache_item_t::init maps the file. No matter it's RAW or GZIP.

valhalla/src/skadi/sample.cc

Lines 85 to 93 in 191760c

    
           bool sample::cache_item_t::init(const std::string& path, format_t format) { 
        
             auto size = file_size(path); 
        
             if (format == format_t::RAW && size != HGT_BYTES) { 
        
               return false; 
        
             } 
        
             this->format = format; 
        
             data.map(path, size, POSIX_MADV_SEQUENTIAL); 
        
             return true; 
        
           }

When coordinate requested in get or get_all function they call source function.

valhalla/src/skadi/sample.cc

Lines 240 to 260 in 191760c

    
           sample::tile_data sample::source(uint16_t index) { 
        
             // bail if its out of bounds 
        
             if (index >= TILE_COUNT) { 
        
               return tile_data(this, index, false, nullptr); 
        
             } 
        
             // if we dont have anything maybe its lazy loaded 
        
             auto& item = cache[index]; 
        
             if (item.get_data() == nullptr) { 
        
               auto f = data_source + get_hgt_file_name(index); 
        
               item.init(f, format_t::RAW); 
        
             } 
        
             if (item.get_format() == format_t::UNKNOWN) { 
        
               return tile_data(this, index, false, nullptr); 
        
             } 
        
             // we have it raw or we dont 
        
             if (item.get_format() == format_t::RAW) { 
        
               return tile_data(this, index, false, (const int16_t*)item.get_data()); 
        
             }

It works the same way as earlier version. Checks tile inside the cache. If there is no mapped data inside cache_item it tries to lazy load hgt file. This part don't use any locks and it should work at the same speeds as version in master.
Magic happens later in source function:

valhalla/src/skadi/sample.cc

Lines 262 to 304 in 191760c

    
           mutex.lock(); 
        
           auto it = pending_tiles.find(index); 
        
           if (it != pending_tiles.end()) { 
        
             auto future = it->second; 
        
             mutex.unlock(); 
        
             return future.get(); 
        
           } 
        
           const char* unpacked = item.get_unpacked(); 
        
           if (unpacked) { 
        
             auto rv = tile_data(this, index, true, (const int16_t*)unpacked); 
        
             mutex.unlock(); 
        
             return rv; 
        
           } 
        
           std::promise<tile_data> promise; 
        
           it = pending_tiles.emplace(index, promise.get_future()).first; 
        
           if (reusable.size() >= UNPACKED_TILES_COUNT) { 
        
             for (auto i : reusable) { 
        
               if (cache[i].get_usages() <= 0) { 
        
                 reusable.erase(i); 
        
                 unpacked = cache[i].detach_unpacked(); 
        
                 break; 
        
               } 
        
             } 
        
           } 
        
           if (!unpacked) { 
        
             unpacked = (char*)malloc(HGT_BYTES); 
        
           } 
        
           reusable.insert(index); 
        
           auto rv = tile_data(this, index, true, (const int16_t*)unpacked); 
        
           mutex.unlock(); 
        
           if (!item.unpack(unpacked)) { 
        
             rv = tile_data(this, index, false, nullptr); 
        
           } 
        
           mutex.lock(); 
        
           promise.set_value(rv); 
        
           pending_tiles.erase(it); 
        
           mutex.unlock(); 
        
           return rv;

It checks current tile in pending_tiles map. It stores future objects of tile_data class. Main goal of tile_data is to increment and decrement reference counter for unpacked buffers. We don't want to unpack everything at once. And it tries to keep count of unpacked buffers under 50 (UNPACKED_TILES_COUNT ).
If there is no pending job it checks unpacked data inside the cache and returns it. If there is no unpacked data in cache_item_t it allocates memory and releases the lock before unpack. Because of this different gzipped tiles could be unpacked in parallel. If requests for same tile called from different threads, they'll wait in future.get();

valhalla/skadi/sample.h

kevinkreiser · 2021-06-10T19:11:25Z

@molind i have the data downloaded and should be able to test it out over the weekend. thanks for your patience

molind · 2021-06-10T19:51:36Z

I’ve generated routing data for a whole planet this week with packed elevation data. Everything worked fine. Waiting for your test results.

roadrouting · 2021-06-10T20:07:10Z

Sorry for the off-topic comment, but I've been meaning to ask: roughly how long should a full planet build with elevation data take?

Our initial experiments have been taking 3-4 days on a very overprovisioned machine. From what we've seen in issues and comments, this feels way too long, and we suspect there is a slow disk causing problems.

dnesbitt61 · 2021-06-10T21:35:28Z

Last planet build I did (with elevation) was about 36 hours. Make sure you use an SSD - I remember trying on a laptop with a hard drive and it was agonizingly slow.

kevinkreiser · 2021-06-10T21:49:17Z

in my experience on amazon infra (and on my personal machine) it takes about 24 hours. these are machines with SSDs and 24-32 threads and something like 32-64GB of ram.

kevinkreiser · 2021-06-25T01:27:58Z

@molind im sorry again i just havent found the time... i just wanted to let you konw i didnt forget, i will review it!

test/sample.cc

kevinkreiser · 2021-07-20T02:24:13Z

src/skadi/sample.cc

@@ -241,11 +200,155 @@ template <class coord_t> double sample::get(const coord_t& coord) const {
  return value / adjust;
 }

-template <class coords_t> std::vector<double> sample::get_all(const coords_t& coords) const {
+::valhalla::skadi::sample::sample(const std::string& data_source) : data_source(data_source) {


i know it was like this before but do you mind removing the namespacing here since its not needed

kevinkreiser · 2021-07-20T02:35:35Z

valhalla/skadi/sample.h

+  std::vector<cache_item_t> cache;
+  std::unordered_set<uint16_t> reusable;
+  std::unordered_map<uint16_t, std::shared_future<tile_data>> pending_tiles;
+  std::recursive_mutex mutex;


@molind what do you think about using the pimpl idiom here to encapsulate all of the cache, basically:

// in sample.h we simple forward declare a generic cache inside the sample class class sample { ... protected: class cache_t; std::unique_ptr<cache_t> cache; }; //then into sample.cc we move all of the details (everything in protected access) struct tile_data_t { ... }; struct cache_item_t { ... }; struct cache_t { ... };

I would like to basically keep the public interface to the sample class as free of details as possible. i know its a little bit more work but i think its better for the end user of the class. maybe i have totally overlooked a detail about why we cant do this but i think the top level methods of sample:: are just the constructor and the couple methods to get samples from the data.

let me know what you think!

kevinkreiser · 2021-07-20T02:43:08Z

src/skadi/sample.cc

+    item.init(f, format_t::RAW);
+  }
+
+  if (item.get_format() == format_t::UNKNOWN) {


Suggested change

if (item.get_format() == format_t::UNKNOWN) {

// it wasnt in cache and when we tried to load it the file was of unknown type

if (item.get_format() == format_t::UNKNOWN) {

kevinkreiser · 2021-07-20T02:44:41Z

src/skadi/sample.cc

+    return tile_data(this, index, false, (const int16_t*)item.get_data());
+  }
+
+  mutex.lock();


Suggested change

mutex.lock();

// we were able to load it but the format wasnt RAW, which only leaves the GZIP format

// now we've got to schedule or wait for some gunzipping to get the raw bytes into cache

mutex.lock();

kevinkreiser · 2021-07-20T02:46:03Z

@molind ive added a couple trivial suggestions and one bigger refactor type suggestion. please have a look and let me know what you think. other than those things, this pr looks perfectly fine to me thank you for clearing that up!

molind · 2021-07-21T17:17:02Z

Great. I'll change it according to the code review.

BTW, Generated routing data for planet on EX52-NVME from Hetzner and it took just 2 hours to add elevation info from gzipped tiles.

2021/07/21 15:02:53.166361 [INFO] Adding elevation to 181525 tiles with 12 threads...
2021/07/21 17:11:14.106379 [INFO] Finished

molind · 2021-09-06T08:34:59Z

@kevinkreiser Refactored as you suggested.

src/skadi/sample.cc

kevinkreiser · 2021-09-06T18:32:42Z

refactor looks great, i like how narrow the api in the header file remains even t hough you added all this functionality. i had a couple of nitpicks and questions, but nothign major!

Clear cache pointer before assignement, otherwise it will try to call decrement_usages on garbage.

molind · 2021-09-07T05:24:43Z

@kevinkreiser Done.

valhalla/skadi/sample.h

kevinkreiser

thank you so much for bearing with me during the review process

kevinkreiser · 2021-09-09T13:02:28Z

CHANGELOG.md

@@ -37,6 +37,7 @@
   * REMOVED: Unused overloads of `to_response` function [#3167](https://github.com/valhalla/valhalla/pull/3167)

 * **Bug Fix**
+   * FIXED: Cache for gzipped elevation tiles [#3120](https://github.com/valhalla/valhalla/pull/3120)


this is in the wrong section, since we've release since you prd this. i will fix it manually after merge

purew · 2021-09-10T16:50:21Z

src/skadi/sample.cc

+  std::unordered_set<uint16_t> reusable;
+  // Map of pending tiles. No matter how many requests received, only one inflate job per tile
+  // started.
+  std::unordered_map<uint16_t, std::shared_future<tile_data>> pending_tiles;


Flagging here that this fails to compile in newest gcc and clang:

Gcc

/usr/include/c++/11.1.0/bits/unordered_map.h:105:18: required from ‘class std::unordered_map<short unsigned int, std::shared_future<valhalla::skadi::tile_data> >’ /home/anders/Documents/Programming/mapbox/valhalla/src/skadi/sample.cc:173:63: required from here /usr/include/c++/11.1.0/future:906:21: error: static assertion failed: result type must be destructible 906 | static_assert(is_destructible<_Res>{}, | ^~~~~~~~~~~~~~~~~~~~~~~ /usr/include/c++/11.1.0/future:906:21: note: ‘std::is_destructible<valhalla::skadi::tile_data>()’ evaluates to false /usr/include/c++/11.1.0/future: In instantiation of ‘class std::future<valhalla::skadi::tile_data>’: /home/anders/Documents/Programming/mapbox/valhalla/src/skadi/sample.cc:329:23: required from here /usr/include/c++/11.1.0/future:769:21: error: static assertion failed: result type must be destructible 769 | static_assert(is_destructible<_Res>{}, | ^~~~~~~~~~~~~~~~~~~~~~~ /usr/include/c++/11.1.0/future:769:21: note: ‘std::is_destructible<valhalla::skadi::tile_data>()’ evaluates to false /usr/include/c++/11.1.0/future: In instantiation of ‘class std::promise<valhalla::skadi::tile_data>’: /home/anders/Documents/Programming/mapbox/valhalla/src/skadi/sample.cc:342:27: required from here /usr/include/c++/11.1.0/future:1065:21: error: static assertion failed: result type must be destructible 1065 | static_assert(is_destructible<_Res>{}, | ^~~~~~~~~~~~~~~~~~~~~~~ /usr/include/c++/11.1.0/future:1065:21: note: ‘std::is_destructible<valhalla::skadi::tile_data>()’ evaluates to false [106/180] Building CXX object src/thor/CMakeFiles/valhalla-thor.dir/astar_bss.cc.o # version g++ -v Using built-in specs. COLLECT_GCC=g++ COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-pc-linux-gnu/11.1.0/lto-wrapper Target: x86_64-pc-linux-gnu Configured with: /build/gcc/src/gcc/configure --prefix=/usr --libdir=/usr/lib --libexecdir=/usr/lib --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=https://bugs.archlinux.org/ --enable-languages=c,c++,ada,fortran,go,lto,objc,obj-c++,d --with-isl --with-linker-hash-style=gnu --with-system-zlib --enable-__cxa_atexit --enable-cet=auto --enable-checking=release --enable-clocale=gnu --enable-default-pie --enable-default-ssp --enable-gnu-indirect-function --enable-gnu-unique-object --enable-install-libiberty --enable-linker-build-id --enable-lto --enable-multilib --enable-plugin --enable-shared --enable-threads=posix --disable-libssp --disable-libstdcxx-pch --disable-libunwind-exceptions --disable-werror gdc_include_dir=/usr/include/dlang/gdc Thread model: posix Supported LTO compression algorithms: zlib zstd gcc version 11.1.0 (GCC)

Clang

/home/anders/Documents/Programming/mapbox/valhalla/src/skadi/sample.cc:173:63: note: in instantiation of template class 'std::unordered _map<unsigned short, std::shared_future<valhalla::skadi::tile_data>>' requested here std::unordered_map<uint16_t, std::shared_future<tile_data>> pending_tiles; ^ In file included from /home/anders/Documents/Programming/mapbox/valhalla/src/skadi/sample.cc:6: /usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/11.1.0/../../../../include/c++/11.1.0/future:769:21: error: cannot initialize object parameter of type 'const std::integral_constant<bool, false>' with an expression of type 'is_destructible<valhalla::skadi::tile_data>' static_assert(is_destructible<_Res>{}, ^~~~~~~~~~~~~~~~~~~~~~~ /home/anders/Documents/Programming/mapbox/valhalla/src/skadi/sample.cc:329:23: note: in instantiation of template class 'std::future<va lhalla::skadi::tile_data>' requested here auto future = it->second; ^ In file included from /home/anders/Documents/Programming/mapbox/valhalla/src/skadi/sample.cc:6: /usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/11.1.0/../../../../include/c++/11.1.0/future:1065:21: error: cannot initialize object paramet er of type 'const std::integral_constant<bool, false>' with an expression of type 'is_destructible<valhalla::skadi::tile_data>' static_assert(is_destructible<_Res>{}, ^~~~~~~~~~~~~~~~~~~~~~~ /home/anders/Documents/Programming/mapbox/valhalla/src/skadi/sample.cc:342:27: note: in instantiation of template class 'std::promise<v alhalla::skadi::tile_data>' requested here std::promise<tile_data> promise; ^ 3 errors generated. # Version clang++ --version clang version 12.0.1 Target: x86_64-pc-linux-gnu Thread model: posix InstalledDir: /usr/bin

It depends on STL version on your machine. It builds fine with libc++ 9, but won't build on libc++ 11.1 :(

Oh, seems like I didn’t build master since the merge.. can smth be done about that? If I can’t build Valhalla anymore on arch linux, I’d have a semi-serious problem

Ohh another arch user! I have a semi-serious problem too :)

lets make an issue out of it and who ever gets to it first can take a stab at it

gcc with libstdc++ 11.1.0 throws this error if tile_data forward declared before cache_t
https://godbolt.org/z/8sYhf8Wqb
while clang 12.0.1 with libc++ works fine. -stdlib=libc++
https://godbolt.org/z/vPYTdb3aW

Evgen Bodunov added 5 commits June 1, 2021 15:02

Cache for gzipped elevation tiles

32d2afd

Changelog update

175bf8d

clang-format

cdedbf3

Fixed tests

0179370

clang-format again.

07dc9cb

kevinkreiser self-requested a review June 1, 2021 18:26

kevinkreiser reviewed Jun 1, 2021

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Evgen Bodunov added 2 commits June 2, 2021 09:56

Merge branch 'master' into packed_elevation

191760c

FIxed init order in constructors. testable_sample_t creates full tile…

ef902e0

…, otherwise cache_item_t won't load it.

kevinkreiser reviewed Jun 2, 2021

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Evgen Bodunov and others added 3 commits June 2, 2021 19:58

set -> unordered_set, map -> unordered_map

edf2774

Merge branch 'master' into packed_elevation

dc71c37

Merge branch 'master' into packed_elevation

90253d5

kevinkreiser self-requested a review June 17, 2021 15:13

Merge branch 'master' into packed_elevation

534d273

Merge branch 'master' into packed_elevation

c935fe7

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molind and others added 3 commits August 25, 2021 19:21

Merge branch 'master' into packed_elevation

3011cfe

Elevation tile cache internals moved into .cc file

14e36cf

Merge branch 'master' into packed_elevation

ae0ee6d

Evgen Bodunov added 2 commits September 6, 2021 13:27

Fix for MSVC

5ad9e2f

MSVC needs operator=

78ea2ed

kevinkreiser reviewed Sep 6, 2021

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Evgen Bodunov added 2 commits September 6, 2021 21:32

Improved readability

382a04c

Fixed undefined behavior

5d9d131

Clear cache pointer before assignement, otherwise it will try to call decrement_usages on garbage.

Merge branch 'master' into packed_elevation

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Headers optimisation

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kevinkreiser approved these changes Sep 9, 2021

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kevinkreiser merged commit 1ad0030 into valhalla:master Sep 9, 2021

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purew mentioned this pull request Sep 10, 2021

nit: Uses switch statements for ensuring full coverage #3314

Closed

kevinkreiser mentioned this pull request Sep 10, 2021

Build Problems on Newer GCC: static_assert(is_destructible #3316

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molind deleted the packed_elevation branch September 11, 2021 06:36

kevinkreiser mentioned this pull request Oct 18, 2021

Running with more than 2 threads #3358

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Cache for gzipped elevation tiles #3120

Cache for gzipped elevation tiles #3120

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		// using memory maps
		mutable std::vector<std::pair<format_t, midgard::mem_map<char>>> mapped_cache;

	if (item.get_format() == format_t::UNKNOWN) {
	// it wasnt in cache and when we tried to load it the file was of unknown type
	if (item.get_format() == format_t::UNKNOWN) {

Cache for gzipped elevation tiles #3120

Cache for gzipped elevation tiles #3120

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